Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 23

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IMPORTANT

Earn 100

If the algebraic sum of deviations of $20$ observations from $30$ is $20,$ then the mean of the observation is

50% studentsanswered this correctly

Important Questions on Statistics

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 24

The variance of first

20

natural numbers is

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IMPORTANT

Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 25

The mean

&

variance of

7

observations are

8, 16

, respectively. If

5

of the observations are

2, 4, 10, 12, 14

, then the LCM of remaining two observations is

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 27

The mean of distribution is

4

if coefficient of variation is

58 %

, then standard deviation of distribution is

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 28

The sum of square of deviations for

10

observations taken from mean

50

is

250 .

The coefficients of variation is

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 29

Standard deviation is independent of

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 30

What is standard deviation of the set of observations

32, 28, 29, 30, 31

?

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 31

If the standard deviation of

x_{1}, x_{2}, \dots . . x_{n}

is

3.5,

then the standard deviation of

- 2 x_{1} - 3, - 2 x_{2} - 3, \dots . - 2 x_{n} - 3

is

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Alpha Question Bank for Engineering: Mathematics>Chapter 23 - Statistics>Exercise-1>Q 32

The marks of some students were listed out of a maximum

100

. The standard deviation of marks was found to be

9

. Subsequently the marks raised to a maximum of

150

and standard deviation of new marks was calculated. The new standard deviation