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The mean of the series a, a + d, a + 2d,...

The mean of the series a, a + d, a + 2d, …, a + 2 nd, is

A

a + nd

B

a-nd

C

(a + n)d

D

ad + n

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The correct Answer is:
A
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MCGROW HILL PUBLICATION-STATISTICS -MULTIPLE CHOICE QUESTIONS
  1. The mean of the following distribution is {:("Class",0-5,5-10,10-15...

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  2. The ages (in years) of a family of 6 members are 1, 5, 12, 15, 38 and ...

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  3. The mean of the series a, a + d, a + 2d, …, a + 2 nd, is

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  4. If each observation is multiplied by 1/3 then the mean of the new data...

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  5. The mean of first 10 natural numbers.

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  6. The value of sum(i=1)^(n) (x(i)-barx) where is the arithmetic mean...

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  7. The average of 15 numbers is 18. The average of first 8 is 19 and that...

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  8. The attendance of a class of 45 boys for 10 days is given as 40, 42, 3...

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  9. The average of n numbers x(1),x(2), …,x(n) is M. If x(n) is replaced b...

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  10. A candidate obtained the following percentage of marks in an examinati...

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  11. A student obtained the following marks per centage in an examination E...

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  12. A contractor employed 18 labourers at Rs 12 per day, 10 labourers at R...

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  13. In a class test in English 10 students scored 75 marks, 12 students sc...

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  14. Find the mean of first five prime numbers

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  15. The algebraic sum of the deviations of a set of value of a data from t...

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  16. A train travels first 300 km at an average rate of 30 km per hour and ...

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  17. The average age of a group of 8 members is same as it was 3 years ago,...

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  18. The mean of ten items is 17 and if each item is increased by 5, then t...

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  19. The mean of 20 items of a data is 5 and if each item is multiplied by ...

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  20. The numbers 3, 5, 6 and 4 have frequencies of x, x + 2, x -8 and x+ 6,...

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