Q 1 The mean of the numbers a b 8 5 10 is 6 and the variance is 6

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Tanveer asks : Q. 1. The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80 . Then which one of the following gives possible values a and b?

Tag : poible,numbers,values,variance
Category : Engineering Entrance | On : 11/01/2012 01:57:27

Answers (2)

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Azith says :

24/01/2012 10:01:20

mean = (a+b+8+5+10)/5 = 6 a+b+23=30 a+b=7 ................................(1) variance = (a2 + b2 +64 + 25+100)/5 - (mean)2 =6.8 (a2 + b2 +189)/5 -36 = 6.8 (a2 + b2 + 9) = 34 a2 + b2 = 25....................(2) from 1 and 2 : a = 3 and b = 4 (or) a=4 and b=3

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Azith says :

24/01/2012 10:02:37

is this a question from 2008 AIEEE paper ??

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Alia kapoor says :

14/01/2012 01:58:10

the possible values of a=4or3 , b=3or4

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