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Mean of the first n terms of the A.P a,...

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

A

`a+(nd)/2`

B

`a+((n-1)d)/2`

C

`a+((n-1)d)`

D

`a+nd`

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The correct Answer is:
B
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PATHFINDER-STATISTICS AND MATHEMATICAL REASONING-QUESTION BANK
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  2. If the mean of the numbers x1, x2, x3,….xn is overlinex, then the mea...

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

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

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

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

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

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

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  9. The mean of a set of observations is overlinex If observations is div...

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  10. The geometric mean of the first n terms of the G.P. a,ar,ar^2,….is

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  11. The geometric mean of the observations 2, 4, 8, 16, 32, 64, is

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  12. A boy goes to school from him home at a speed of x km/hr. and comes ba...

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  13. Ram spends equal amounts on purchasing three kinds of pens being sold ...

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  14. An automobile driver travels from plain to a hill station 120 km dista...

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  15. If a, b, c, are any three positive numbers , then the least value of (...

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  16. The median of the data 13, 14, 16, 18, 20, 22 is

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  17. For a continuous series the mode is computed by the formula

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  18. If mean = (3median - mode)x, then the value of x is

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  19. The mean deviation from median is

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  20. The mean deviation from the median is

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