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## CBSE Guide Statistics class 11 Notes

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## Statistics class 11 Notes Mathematics

Download CBSE class 11th revision notes for Chapter 15 Statistics class 11 Notes Mathematics in PDF format for free. Download revision notes for Statistics class 11 Notes Mathematics and score high in exams. These are the Statistics class 11 Notes Mathematics prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.

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**CBSE Class 11 Mathematics Revision Notes Chapter-15 Statistics class 11 Notes Mathematics **

**Mean:****Median**: If the number of observations is odd, then median is observation and if the number of observations is even, then median is the mean of and observations.**Measures of Dispersion, Range and Mean Deviation****Variance and Standard Deviation****Analysis of Frequency Distributions**

**Measures of dispersion**Range, Quartile deviation, mean deviation, variance, standard deviation are measures of dispersion.- Range = Maximum Value – Minimum Value
**Mean deviation for ungrouped data**

**Mean Deviation from Median for ungrouped data**

**Mean deviation for grouped data**

**Mean Deviation from Median for grouped data**

**where N =****Variance and standard deviation for ungrouped data**

Variance:

Standard deviation:**Variance and standard deviation of a discrete frequency distribution**

Variation:

Standard deviation:**Variance and standard deviation of a continuous frequency distribution**

(i) If

= 1, 2, 3, ………., is a continuous frequency distribution of a variate X,then

(ii) If

be the given observations with respective frequencies, then , where N =

(iii) If

where A is assumed mean, then(iv) If

where is the common difference of values of then**Analysis of frequency distribution with equal means but different variances**: If the S.D. of group A < the S.D. of group B, then group A is considered more consistent or uniform.**Ananlysis of frequency distribution with unequal means**: In this case we compare the coefficient of variation [Coefficient of variation (C.V. = The series having greater coefficient of variation is said to be more variable than the other.- Variance of the combined two series:

where and are the sizes of two groups, and are the S.D. of two groups, , and

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**CBSE Class-11 Revision Notes and Key Points**

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