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For a frequency distribution standard de...

For a frequency distribution standard deviation is computed by applying the formula\ `sigma=sqrt((sumfd^2)/(sumf)-((sumfd^)/(sumf))^2)` (b) `sigma=sqrt(((sumfd^2)/(sumf))-(sumfd^2^)/(sumf))` (c) `sigma=sqrt((sumfd^2)/(sumf)-(sumfd^^)/(sumf))` (d) `sqrt(((sumfd^)/(sumf))^2-(sumfd^2^)/(sumf))`

A

`sigma=sqrt((sumfd)/(sumf))-(sum fd^(2)/(sum f))`

B

`sigma=sum((sum fd^(2))/(sum f)-((sum fd^(2))/(sum f)^(2))`

C

`sigma=sqrt((sum fd)/sumf)^(2)-(sum fd^(2))/(sum f))`

D

`sigma=sqrt((sum fd^(2))/(sum f)-((sum fd)/sum f)^(2))`

Text Solution

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The correct Answer is:
D
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FIITJEE-STATISTICS-Assignment Problems (Objective) Level II
  1. The standard deviation for the set of numbers, 1,4,5,7,8 is nearly 2.4...

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  2. For a frequency distribution lower quartile is computed by

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  3. The upper quartile for the following distribution is given by the s...

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  4. Quartile deviation for a frequency distribution is

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  5. The variance of first n natural number is:

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  6. For a frequency distribution standard deviation is computed by

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  7. For a frequency distribution standard deviation is computed by applyin...

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  8. d(1) is the deviation of a class mark y(i) from 'a' the assumed mean a...

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  9. The difference between the highest and lowest values of the observa...

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  10. b(xy) xx b(yx) is equal to

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  11. Which of the following is true?

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  12. Which of the following is not possible

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  13. If ui=axi+b and vi =cyi+d then

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  14. If yi=axi+b for each i=1,2,3,........n, then

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  15. If e gt 0 and m=(byx +bxy)/(2), then

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  16. Covariance (x,y) between x and if sumx=15, sum y=40, sumxy=110, n=5 is

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  17. Which of the following is a measure of central tendency

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  18. The mean of then Numbers 0,1,2,3.......n with respective weights ""^(n...

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  19. If x and y are uncorrelated variables and if U=x+y and V=x-y, then e(u...

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  20. For a moderately skewed distribution

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