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JEE MATHEMATICS MCQ: STATISTICS

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Application +4 | -1

The weighted mean of first

n

natural number if their weight are the same as the number is-

View answer and explanation

Correct option: C

\frac{2 n+1}{3}

Option C (

\frac{{2n+1}}{{3}}

) is correct because the weighted mean is calculated using the formula

\frac{{\sum wx}}{{\sum w}}

, where w is the weight and x is the value.

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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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