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If the mean of four numbers 2,6,7 and a is 15 and also the mean of other five numbers 6, 18 , 1, a, b is 50. What is the value of a and b?

Posted by Daxita Jain 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Paru ? 5 years, 1 month ago

Value of a=45 & b=180

2Thank You

Swarnima Verma 5 years, 1 month ago

Mean = sum of observations / no. of observations 15 = (2 + 6 + 7 +a)/4 15 = (15 + a) / 4 15 * 4 = 15 + a 60 – 15 = a a = 45 Similarly, Mean = sum of observations / no. of observations 50 = (18 + 6 + 1 +a + b)/5 50 = (18 + 6 + 1 +45 + b)/5 50 = (70 + b)/5 250 = 70 + b b = 250 – 70 = 180 So, The value of b = 180.

3Thank You

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