JEE MATHEMATICS MCQ: STATISTICS

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Application +4 | -1

If the average of the numbers 148, 146, 144, 142, ... in AP, be 125, then the total numbers in the series will be

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Correct option: B

Option B (24) is correct because the total number of terms in the AP series is calculated using the average and the properties of arithmetic progressions.

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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

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