If the mean and variance of six observations 7, 10, 11, 15, a, b are 10 and
respectively, then the value of
is equal to
If the mean and variance of six observations 7, 10, 11, 15, a, b are 10 and respectively, then the value of is equal to
Option 1 -
9
Option 2 -
7
Option 3 -
11
Option 4 -
1
Asked by Shiksha User
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1 Answer
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Correct Option - 4
Detailed Solution:10 =
a2 + b2 = 145 . (ii)
solving (i) and (ii) we get a = 8, b = 9 or a = 9, b = 8
|a – b|= 1
Similar Questions for you
V
Vishal Baghel
a, b, c, d, e be 5 unknown
n = 7, mean = 8, variance = 16
sum of observations = 7 × 8 = 56
mean of 5 remaining observation =
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