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JEE MATHEMATICS MCQ: STATISTICS

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Application +4 | -1

If the first item is increased by 1, second by 2 and so on, then the new mean is

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Correct option: C

\bar X + \frac{{n + 1}}{2}

Option C (

\bar X + \frac{{n + 1}}{2}

) is correct because it represents the new mean after increasing each item by its position in the series.

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If the mean of a set of observations

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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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