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If the mean of first n natural numbers ...

If the mean of first `n` natural numbers is equal to `(n+7)/3` , then `n` is equal to

A

10

B

11

C

12

D

none of these

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The correct Answer is:
C
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PATHFINDER-STATISTICS AND MATHEMATICAL REASONING-QUESTION BANK
  1. The mean of the squares of first natural numbers is

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  2. For a continuous series the mean is computed by the following formula

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  3. If the mean of first n natural numbers is equal to (n+7)/3 , then n i...

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  4. The mean of discrete observation y1, y2,…yn is given by

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  5. The mean of 130, 126, 68, 50, 1 is

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  6. If di is the deviation of a class mark yi from 'a' the ' assumed mean ...

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  7. The mean of first three terms is 14 and mean of next two terms is 18. ...

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  8. Geometric mean of the numbers 2, 2^2, 2^3, ….,2^(n) numbers is

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  9. The geometric mean of numbers observations x1, x2, x3,….,xn is

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  10. The geometric mean of numbers observations 4, 8, 16, is

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  11. The harmonic mean of 4, 8, 16, is

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  12. The harmonic mean of 3, 7, 8, 10, 14, is

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  13. Product of n positive number is unity. The sum of these numbers can n...

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  14. In an arranged series of n observations (n being an odd number), the ...

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  15. The median of 10, 14, 11, 9, 8, 12, 6, is

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  16. If a variable takes the discrete values alpha+4 , alpha-(7)/(2), alpha...

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  17. In an arranged discrete series in which total number of observations ...

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  18. The mode of following items 0, 1, 6, 7, 2, 3, 7, 6, 6, 2, 6, 0, 5, 6,...

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  19. Choose the correct answer: The hybridisation of the carbon atom (under...

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  20. For a normal distribution, we have

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