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Mean of first n natural numbers is...

Mean of first n natural numbers is

A

`(n(n-1))/2`

B

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

C

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

D

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

Text Solution

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The correct Answer is:
D
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PATHFINDER-STATISTICS AND MATHEMATICAL REASONING-QUESTION BANK
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  3. Mean of first n natural numbers is

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  4. (x1-overlinex)+(x2-overlinex)+....+(xn-overlinex)=

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  5. If the mean of the table is 8, then find the value of P.

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  6. A factory employs 100 workers of whom 60 in the first shift and 40 wo...

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  7. Geometric mean of 3, 9 and 27 is

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  8. The median of the items 6, 10, 4, 3, 11, 22, 18, is

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  9. If median = (mode + 2 mean ) Mean, then Mean is equal to

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  10. The scores of a batsman in ten innings are : 38, 70, 48, 34, 42, 55, 6...

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  11. The Standard Deviation of scores 1, 2, 3, 4, 5 is

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  12. If the mean of the first n odd natural numbers be numbers itself, then...

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  13. The A.M of the series 1, 2, 4, 8, 16…., 2^n is

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  14. If the mean of the numbers x1, x2, x3,….xn is overlinex, then the mea...

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  15. Mean of the first n terms of the A.P a,(a+d),(a+2d),…..is

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  16. If mu is the mean of a distribution , then sumfi(yi-mu) is equal to

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  17. If the mean of n observations 1^2, 2^2, 3^2,….n^2 is (46n)/(11) then ...

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  18. The mean of 50 observations is 36. If two observations 30 and 42 are d...

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  19. the weighted mean of first n natural numbers whose weights are equal ...

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  20. A group of 10 items has mean 6 If the mean of 4 of these items is 7.5 ...

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