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The weighted A . M of first 'n' natural ...

The weighted A . M of first 'n' natural numbers whose weights are equal to the corresponding

A

`(1)/(2)(n+1)`

B

`(1)/(2)(2n+1)`

C

`(1)/(3)(2n+1)`

D

`(1)/(6)(2n+1)`

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NEW JOYTHI PUBLICATION-STATISTICS-EXSERCISE
  1. The A . M first 'n' natural numbers is

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  2. The mean of 1,2,3 …… n is (6n)/(11) , then n =

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  3. The weighted A . M of first 'n' natural numbers whose weights are equa...

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  4. If the mean of 7+x,1+x,9+x,2+x,6+x is 5, then the mean of 13+x,12+x,8+...

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  5. The AM of the squares of the first 'n' natural numbers is

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  6. If overlineX(1),overlineX(2) are the means of two distributions such ...

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  7. A variable X is expressed as a linear function of two variables u and ...

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  8. The mean of a set of numbers is overline(x) . If each number is incre...

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  9. The mean of a set of numbers is overlinex. If each observation is div...

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  10. The algebraic sum of the deviations from the mean is

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  11. The median of the series is 10 . Two additional observations 7 and 20...

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  12. The range of the data 41,68,7,53,4,75,11,89,47 is

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  13. The mean and variance of 7 observations are 8 and 16 respectively . If...

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  14. Variance is independent of

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  15. If the S.D of 0,1,2,….9 is a, then the S.D of 10,11,12,…. 19 is

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  16. The mode of the obeservations 3,5,1,7,9,1,12 is

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  17. The AM of 1,2,4,8 …… 2^(n) is

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  18. If a variable takes the values 0,1,2,…. N with frequencies 1,""^(n)C(1...

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  19. The GM of 2, 2^(2),2^(3).......2^(n) is

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  20. The mean mark in statistics of 100 students in a class was 72. The mea...

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