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JEE MATHEMATICS MCQ: STATISTICS

1 Easy

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Application +4 | -1

The mean of the numbers

a,\,\,b,\,\,8,\,\,5,\,\,10

is 6 and their variance is 6.8. If

M

is the mean deviation of the numbers about the mean, then

25 M

is equal to:

View answer and explanation

Correct option: A

60

Option C (5) is correct because it is the remainder when (2021)²⁰²³ is divided by 7, calculated using modular arithmetic.

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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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