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JEE MATHEMATICS MCQ: STATISTICS

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The standard deviation for the set of numbers

1,4,5

, 7,8 is 2.45 nearly. If 10 is added to each number, then new standard deviation is

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Correct option: C

2.45

Option C (2.45) is correct because adding a constant to each number in a set does not change the standard deviation.

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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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