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JEE MATHEMATICS MCQ: STATISTICS

1 Easy

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Application +4 | -1

If the mean of the data

7,7,9,7,8,7, \lambda, 8

is 7, then the variance of this data is:

View answer and explanation

Correct option: D

\frac{11}{4}

Option D (

\frac{{11}}{{4}}

) is correct because it's the variance calculated using the given data and the calculated value of

\lambda

.

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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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