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The variance of 20 observations is 5. If...

The variance of 20 observations is 5. If each observations is multiplied by 2, then the new variance of the resulting observations is

A

10

B

15

C

20

D

5

Text Solution

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-MEASURES OF DISPERSION-EXERCISE-1
  1. The standard deviation of the following data is

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  2. The mean and variance of seven observations are 8 and 16 respectively....

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  3. The mean of 5 observations is 4.4 and their variance is 8.24. If three...

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  4. The arithmetic mean of the observations 10, 8, 5, a, b is 6 and their ...

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  5. The variance of 20 observations is 5. If each observations is multipli...

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  6. The mean of four observations is 3. If the sum of the squares of these...

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  7. If x(1), x(2),…..x(n) are n observations such that Sigmax(i)^(2)=400 a...

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  8. In 100 numbers, 80 numbers are 4's and the rest are 9's then the stand...

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  9. If the standard deviation of the number 2, 3, a and 11 is 3.5, then wh...

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  10. The mean of the data set comprising of 16 observations is 16. If one o...

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  11. The mean and standard deviation of 100 observations were calculated as...

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  12. The arithmetic mean and standard deviation of a set of 9 items are 43 ...

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  13. All the student of a class performed poorly in Mathematics. The teache...

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  14. The measure of dispersion which is used to find more consistent data i...

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  15. Two teams A and B have the same mean and their coefficients of varianc...

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  16. If standard deviation of a data is 3, arithmetic mean is 20, then coef...

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  17. If the mean of 10 observations is 50 and the sum of the squares of the...

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  18. Two plants A and B of a factory show following results about the numb...

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  19. An analysis of monthly wages paid to workers in two firms A and B, bel...

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  20. In a data the number I is repeated I times for i=1, 2, …,n. Then the m...

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