{"id":4294,"date":"2016-05-13T11:49:00","date_gmt":"2016-05-13T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-7-maths-data-handling-ex-3-1\/"},"modified":"2018-07-06T16:39:24","modified_gmt":"2018-07-06T11:09:24","slug":"ncert-solutions-for-class-7-maths-exercise-3-1","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/","title":{"rendered":"NCERT Solutions for Class 7 Maths Exercise 3.1"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#NCERT_Solutions_for_Class_7_Maths_Data_Handling\" >NCERT Solutions for Class 7 Maths\u00a0Data Handling<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Class_%E2%80%93VII_Mathematics_Ex_31\" >Class \u2013VII Mathematics (Ex. 3.1)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_1Find_the_range_of_heights_of_any_ten_students_of_your_class\" >Question 1.Find the range of heights of any ten students of your class.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_2Organize_the_following_marks_in_a_class_assessment_in_a_tabular_form\" >Question 2.Organize the following marks in a class assessment, in a tabular form:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_3Find_the_mean_of_the_first_five_whole_numbers\" >Question 3.Find the mean of the first five whole numbers.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_4A_cricketer_scores_the_following_runs_in_eight_innings_58_76_40_35_46_45_0_100_Find_the_mean_score\" >Question 4.A cricketer scores the following runs in eight innings: 58, 76, 40, 35, 46, 45, 0, 100 Find the mean score.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_5Following_table_shows_the_points_of_each_player_scored_in_four_games\" >Question 5.Following table shows the points of each player scored in four games:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_6The_marks_out_of_100_obtained_by_a_group_of_students_in_a_science_test_are_85_76_90_85_39_48_56_95_81_and_75_Find_the\" >Question 6.The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_7The_enrolment_in_a_school_during_six_consecutive_years_was_as_follows\" >Question 7.The enrolment in a school during six consecutive years was as follows:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_8The_rainfall_in_mm_in_a_city_on_7_days_of_a_certain_week_was_recorded_as_follows\" >Question 8.The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#Question_9The_height_of_10_girls_were_measured_in_cm_and_the_results_are_as_follows\" >Question 9.The height of 10 girls were measured in cm and the results are as follows:<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#NCERT_Solutions_for_Class_7_Maths_Exercise_31\" >NCERT Solutions for Class 7 Maths Exercise 3.1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/#CBSE_app_for_Students\" >CBSE app for Students<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 7 Maths Exercise 3.1 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Maths chapter wise NCERT solution for Maths Book all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Maths\u00a0Data Handling <\/strong><strong><a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-07-mathematics-data-handling\/1512\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/07_Maths_Book.jpg\" alt=\"NCERT Solutions for Class 7 Maths Exercise 3.1\" width=\"161\" height=\"204\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_7_Maths_Data_Handling\"><\/span>NCERT Solutions for Class 7 Maths\u00a0Data Handling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Class_%E2%80%93VII_Mathematics_Ex_31\"><\/span><strong>Class \u2013VII Mathematics (Ex. 3.1)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<h6><span class=\"ez-toc-section\" id=\"Question_1Find_the_range_of_heights_of_any_ten_students_of_your_class\"><\/span><strong>Question 1.<\/strong>Find the range of heights of any ten students of your class.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<table class=\"responsive\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>S. No.<\/td>\n<td>Name of students<\/td>\n<td>Height (in feet)<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>Gunjan<\/td>\n<td>4.2<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>Aditi<\/td>\n<td>4.5<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Nikhil<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>Akhi<\/td>\n<td>5.1<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>Riya<\/td>\n<td>5.2<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>Akshat<\/td>\n<td>5.3<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>Abhishek<\/td>\n<td>5.1<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>Mayank<\/td>\n<td>4.7<\/td>\n<\/tr>\n<tr>\n<td>9<\/td>\n<td>Rahul<\/td>\n<td>4.9<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>Ayush<\/td>\n<td>4.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Range = Highest height \u2013 Lowest height<\/p>\n<p>= 5.3 \u2013 4.2<\/p>\n<p>= 1.1 feet.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_2Organize_the_following_marks_in_a_class_assessment_in_a_tabular_form\"><\/span><strong>Question 2.<\/strong>Organize the following marks in a class assessment, in a tabular form:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7.<\/p>\n<p>(i)Which number is the highest?<\/p>\n<p>(ii)Which number of the lowest?<\/p>\n<p>(iii) What is the range of the lowest?<\/p>\n<p>(iv) Find the arithmetic mean<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<table class=\"responsive\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td rowspan=\"2\"><strong>S. No.<\/strong><\/td>\n<td rowspan=\"2\"><strong>Marks<\/strong><\/td>\n<td rowspan=\"2\"><strong>Tally marks<\/strong><\/td>\n<td><strong>Frequency<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>(No. of students)<\/strong><\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>1<\/td>\n<td rowspan=\"9\"><img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/07\/mathematics\/07_math_ncert_ch03_03.png\" \/><\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>3<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>4<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>5<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>6<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>7<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>8<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>9<\/td>\n<td>9<\/td>\n<td>1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>(i)The highest number is 9.<\/p>\n<p>(ii)The lowest number is 1.<\/p>\n<p>(iii)The range of the data is 9 \u2013 1 = 8<\/p>\n<p>(iv)Arithmetic mean =<\/p>\n<p>{tex}\\frac{{4 + 6 + 7 + 5 + 3 + 5 + 4 + 5 + 2 + 6 + 2 + 5 + 1 + 9 + 6 + 5 + 8 + 4 + 6 + 7}}{{20}}{\/tex}<\/p>\n<p>= {tex}\\frac{{100}}{{20}}{\/tex} =5<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_3Find_the_mean_of_the_first_five_whole_numbers\"><\/span><strong>Question<\/strong> 3.Find the mean of the first five whole numbers.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>The first five whole numbers are 0, 1, 2, 3 and 4.<\/p>\n<p>Therefore, Mean of first five whole numbers = {tex}\\frac{{{\\text{Sum of numbers}}}}{{{\\text{Total number}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{0 + 1 + 2 + 3 + 4}}{5}{\/tex} = {tex}\\frac{{10}}{5}{\/tex} =2<\/p>\n<p>Thus, the mean of first five whole numbers is 5.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_4A_cricketer_scores_the_following_runs_in_eight_innings_58_76_40_35_46_45_0_100_Find_the_mean_score\"><\/span><strong>Question<\/strong> 4.A cricketer scores the following runs in eight innings: 58, 76, 40, 35, 46, 45, 0, 100 Find the mean score.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Number of innings = 8<\/p>\n<p>Mean of score = {tex}\\frac{{{\\text{Sum of scores}}}}{{{\\text{Number of innings}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{58 + 76 + 40 + 35 + 46 + 45 + 0 + 100}}{8}{\/tex} = {tex}\\frac{{400}}{8}{\/tex} = 50<\/p>\n<p>Thus, the mean score is 50.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_5Following_table_shows_the_points_of_each_player_scored_in_four_games\"><\/span><strong>Question<\/strong> 5.Following table shows the points of each player scored in four games:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<table class=\"responsive\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Player<\/td>\n<td>Game 1<\/td>\n<td>Game 2<\/td>\n<td>Game 3<\/td>\n<td>Game 4<\/td>\n<\/tr>\n<tr>\n<td>A<\/td>\n<td>14<\/td>\n<td>16<\/td>\n<td>10<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>B<\/td>\n<td>0<\/td>\n<td>8<\/td>\n<td>6<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>C<\/td>\n<td>8<\/td>\n<td>11<\/td>\n<td>Did not play<\/td>\n<td>13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>(i) Find the mean to determine A\u2019s average number of points scored per game.Now answer the following questions:<\/p>\n<p>(ii) To find the mean number of points per game for C, would you divide the total points by 3 or 47? Why?<\/p>\n<p>(iii) B played in all the four games. How would you find the mean?<\/p>\n<p>(iv)Who is the best performer?<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(i) Mean of player A = {tex}\\frac{{{\\text{Sum of scores by A}}}}{{{\\text{No}}{\\text{. of games played by A}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{14 + 16 + 10 + 10}}{4} = \\frac{{50}}{4}{\/tex} = 12.5<\/p>\n<p>(ii) We should divide the total points by 3 because player C played only three games.<\/p>\n<p>(iii) Player B played in all the four games.<\/p>\n<p>{tex}\\therefore {\/tex} Mean of player B = {tex}\\frac{{{\\text{Sum of scores by B}}}}{{{\\text{No}}{\\text{. of games played by B}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{0 + 8 + 6 + 4}}{4} = \\frac{{18}}{4}{\/tex} = 4.5<\/p>\n<p>(iv) To find the best performer, we should know the mean of all players.<\/p>\n<p>Mena of player A = 12.5<\/p>\n<p>Mean of player B = 4.5<\/p>\n<p>Mean of player C = {tex}\\frac{{8 + 11 + 13}}{3} = \\frac{{32}}{3}{\/tex} = 10.67<\/p>\n<p>Therefore, on comparing means of all players, player A is the best performer.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_6The_marks_out_of_100_obtained_by_a_group_of_students_in_a_science_test_are_85_76_90_85_39_48_56_95_81_and_75_Find_the\"><\/span><strong>Question<\/strong> 6.The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(i)The highest and the lowest marks obtained by the students.<\/p>\n<p>(ii)Range of the marks obtained<\/p>\n<p>(iii) Mean marks obtained by the group.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(i) Highest marks obtained by the student = 95<\/p>\n<p>Lowest marks obtained by the student = 39<\/p>\n<p>(ii) Range of marks = Highest marks \u2013 Lowest marks<\/p>\n<p>= 95 \u2013 39 = 56<\/p>\n<p>(iii) Mean of obtained marks = {tex}\\frac{{{\\text{Sum of marks}}}}{{{\\text{Total number of marks}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{85 + 76 + 90 + 85 + 39 + 48 + 56 + 95 + 81 + 75}}{{10}}{\/tex}<\/p>\n<p>= {tex}\\frac{{730}}{{10}}{\/tex} = 73<\/p>\n<p>Thus, mean marks obtained by the group of students is 73.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_7The_enrolment_in_a_school_during_six_consecutive_years_was_as_follows\"><\/span><strong>Question<\/strong> 7.The enrolment in a school during six consecutive years was as follows:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>1555, 1670, 1750, 2013, 2540, 2820. Find the mean enrolment of the school for this period.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>Mean enrolment = {tex}\\frac{{{\\text{Sum of numbers of enrolment}}}}{{{\\text{Total number of enrolment}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{1555 + 1670 + 1750 + 2013 + 2540 + 2820}}{6}{\/tex}<\/p>\n<p>= {tex}\\frac{{12348}}{6}{\/tex} = 2058<\/p>\n<p>Thus, the mean enrolment of the school is 2,058.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_8The_rainfall_in_mm_in_a_city_on_7_days_of_a_certain_week_was_recorded_as_follows\"><\/span><strong>Question<\/strong> 8.The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<table class=\"responsive\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Day<\/td>\n<td>Mon<\/td>\n<td>Tue<\/td>\n<td>Wed<\/td>\n<td>Thurs<\/td>\n<td>Fri<\/td>\n<td>Sat<\/td>\n<td>Sun<\/td>\n<\/tr>\n<tr>\n<td>Rainfall (in mm)<\/td>\n<td>0<\/td>\n<td>12.2<\/td>\n<td>2.1<\/td>\n<td>0<\/td>\n<td>20.5<\/td>\n<td>5.5<\/td>\n<td>1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>(i)Find the range of the rainfall in the above data.<\/p>\n<p>(ii)Find the mean rainfall for the week.<\/p>\n<p>(iii)On how many days was the rainfall less than the mean rainfall?<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(i) The range of the rainfall = Highest rainfall \u2013 Lowest rainfall<\/p>\n<p>= 20.5 \u2013 0.0 = 20.5 mm<\/p>\n<p>(ii) Main rainfall = {tex}\\frac{{{\\text{Sum of rainfall recorded}}}}{{{\\text{Total number of days}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{0.0 + 12.2 + 2.1 + 2.2 + 20.5 + 5.5 + 1.0}}{7}{\/tex}<\/p>\n<p>= {tex}\\frac{{41.3}}{7}{\/tex} = 5.9 mm<\/p>\n<p>(iii) 5 days. i.e., Monday, Wednesday, Thursday, Saturday and Sunday rainfalls were less than the mean rainfall.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 3.1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_9The_height_of_10_girls_were_measured_in_cm_and_the_results_are_as_follows\"><\/span><strong>Question<\/strong> 9.The height of 10 girls were measured in cm and the results are as follows:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>135, 150, 139, 128, 151, 132, 146, 149, 143, 141<\/p>\n<p>(i)What is the height of the tallest girl?<\/p>\n<p>(ii)What is the height of the shortest girl?<\/p>\n<p>(iii)What is the range of data?<\/p>\n<p>(iv)What is the mean height of the girls?<\/p>\n<p>(v)How many girls have heights more than the mean height?<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(i) The height of the tallest girl = 151 cm<\/p>\n<p>(ii) The height of the shortest girl = 128 cm<\/p>\n<p>(iii) The range of the data = Highest height \u2013 Lowest height<\/p>\n<p>= 151 \u2013 128 = 23 cm<\/p>\n<p>(iv) The mean height = {tex}\\frac{{{\\text{Sum of heights of the girsl}}}}{{{\\text{Total numebr of girls}}}}{\/tex}<\/p>\n<p>= {tex}\\frac{{135 + 150 + 139 + 128 + 151 + 132 + 146 + 149 + 143 + 141}}{{10}}{\/tex}<\/p>\n<p>= {tex}\\frac{{1414}}{{10}}{\/tex} = 141.4 cm<\/p>\n<p>(v) Five girls, i.e., 150, 151, 146, 149, 143 have heights (in cm) more than the mean height.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_7_Maths_Exercise_31\"><\/span>NCERT Solutions for Class 7 Maths Exercise 3.1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 7 Maths PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 7 Maths includes text book solutions from Class 7 Maths Book . NCERT Solutions for CBSE Class 7 Maths have total 15 chapters. 7 Maths NCERT Solutions in PDF for free Download on our website. Ncert Maths class 7 solutions PDF and Maths ncert class 7 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Students\"><\/span>CBSE app for Students<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download NCERT Solutions for Class 7 Maths, Social Science Computer Science, Home Science, Hindi English, Maths Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 7 Maths Exercise 3.1 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Maths chapter wise &#8230; <a title=\"NCERT Solutions for Class 7 Maths Exercise 3.1\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-3-1\/\" aria-label=\"More on NCERT Solutions for Class 7 Maths Exercise 3.1\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1388,281],"tags":[283,1535,321,1485,216],"class_list":["post-4294","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mathematics-cbse-class-07","category-ncert-solutions","tag-cbse-study-material","tag-class-7","tag-mathematics","tag-maths","tag-ncert-solutions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 7 Maths Exercise 3.1 | myCBSEguide<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 7 Maths Exercise 3.1 in PDF format for free download. 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