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The standard deviation for the set of th...

The standard deviation for the set of the numbers 1,4,5,7,8 is 2.45. If 10 is added to each number then new standard deviation is

A

2.45

B

24.5

C

0.245

D

12.45

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A
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Consider the following statements : (i) Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation the new mean and standard deviation are 55, 10. (ii) Mean of 100 observations is 50 and standard deviation is 10. If each observation is multiplied by 3 then the new mean and standard deviation are 50, 10/3. The true statements are :

AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Practice Exercise
  1. Mean deviation of 39,40,41,41,42,42,43,43,44,44, 45 through median is

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  2. Mean deviation from median of the data 90,100,125,115, 110 is

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  3. The mean deviation from mean of the data 90,100,125,115,110 is

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  4. The standard deviation of 7 scores 1,2,3,4,5,6,7 is

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  5. The standard deviation of 15 items is 6 and each item is decreased by ...

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  6. The standard deviation for the set of the numbers 1,4,5,7,8 is 2.45. I...

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  7. Standard deviation of 5,8,11,9,11 is

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  8. If the standard deviation of x(1),x(2),….,x(n) is 3.5 then the standar...

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  9. If the standard deviation of 0,1,2,3,4,5,6,7,8,9 is K, then the standa...

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  10. The variance of first 20 - natural numbers is

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  11. The variance of 6,8,10,12,14,16,18,20,22,24 is

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  12. Observe the following statements : (A) : 10 is the mean of a set of ...

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  13. A man motors from A to B. A large part of the distace is uphill and he...

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  14. An aeroplane files around a square, the sides of which measure 100 mil...

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  15. The mean of a data set consisting of 20 observation is 40. If one obse...

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  16. Mean of 100 observations is 50 and S.D. is 10. If 5 subtracted from ea...

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  17. Consider the following statements : (i) Mean of 100 observations is ...

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  18. I. The geometric mean of 2,4,16 and 32 is a II. The strength of 7 co...

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  19. If the mean deviation of number 1,1+d,…1+100d from their mean is 255, ...

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  20. The mean of 5 observations is 5 and their variance is 124. If three of...

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