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JEE MATHEMATICS MCQ: STATISTICS

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Application +4 | -1

Mean of 5 observations is 7 . If four of these observations are

6,7,8,10

and one is missing then the variance of all the five observations is :

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Correct option: D

2

Option D (2) is correct. The variance is calculated after finding the missing observation using the given mean.

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If the mean of a set of observations

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\bar X,

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{x_i} + 2\;i;i = 1,\;2, \ldots ,n

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the s.d. of the new set of observations will be