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JEE MATHEMATICS MCQ: STATISTICS

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The means of five observations is 4 and their variance is 5.2. If three of these observations are 1,2 , and 6 , then the other two are:

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Correct option: C

4 and 7

Option C (4 and 7) is correct because these values satisfy both the mean and variance conditions given in the problem.

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\bar X,

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is The sum of 10 items is 12 and sum of their squares is 18 , then standard deviation will be In a family, there are 8 men, 7 women and 5 children whose mean ages separately are respectively 24,20 and 6 years. The mean age of the family is The mean and variance of seven observations are 8 and 16, respectively. If 5 of the observations are 2, 4, 10, 12, 14, then the product of the remaining two observations is

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