Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 25

HARD

JEE Main

IMPORTANT

Earn 100

The variance of series $a, a + d, a + 2 d, ......, a + 2 n d$ is:

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Important Questions on Statistics

HARD

JEE Main

IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 26

The

S . D .

of first

n

odd natural numbers is :-

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IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 27

If the standard deviation of the numbers

2, 3, a

and

11

is

3.5

, then

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IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 28

The variance of the variates

112, 116, 120, 125, 132

about their A.M is

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IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 29

Let

O

be the mean deviation of the first five odd natural numbers about their mean and

P

be the mean deviation of the first five prime numbers about their mean. Then

P - O =

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Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 30

Which of the following data has minimum variance?

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IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 31

Let

λ

is the variance of first

50

odd natural number, then the value of

λ - 830

is equal to

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Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 2>Q 1

If a variate

X

is expressed as a linear function of two variates

U

and

V

in the form

X = a U + b V,

then Mean

\bar{X}

of

X

is

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IMPORTANT

Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 2>Q 2

In a group of students, the mean weight of boys is

65 kg

, and mean weight of girls is

55 kg

. If the mean weight of all students of group is

61 kg

, then the ratio of the number of boys and girls in the group is