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The Harmonic mean of the numbers 2,3,4 i...

The Harmonic mean of the numbers 2,3,4 is

A

`3sqrt(24)`

B

3

C

`(13)/(36)`

D

`(36)/(13)`

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The correct Answer is:
D
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AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Exercise - I
  1. If the Geometrical mean of x, 16, 50 is 20, then the value of x is

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  2. The reciprocal of the mean of the reciprocals of n observations is

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  3. The Harmonic mean of the numbers 2,3,4 is

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  4. If A.M. = 24.5, G.M. 24.375 then H.M. =

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  5. In problems on speed of a body, the average used is

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  6. The H.M. of the numbers 1/5, 1/10, 1/15, 1/20, 1/25, 1/30, 1/35 is

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  7. A man travels at a speed of 20 Km/hr. and then returns at a speed of 3...

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  8. The mean deviation from the mean for the set of observation -1, 0, 4 i...

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  9. Mean deviation from the mean for data 6, 7 10, 12, 13, 4, 8, 12 is

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  10. The mean deviation of the number 3, 4, 5, 6, 7 from median is

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  11. If mean deviation through median is 15 and median is 450, then coeffic...

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  12. In a moderated asymmetrical distribution S.D. is 20 then the mean devi...

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  13. The mean and S.D. of 1,2,3,4,5,6 is

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  14. For a series the information available is n = 10 sum x = 60, sum x^(2)...

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  15. Coefficient of variation of a distribution is 60 and its standard devi...

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  16. If the mean of 10 observations is 50 and the sum of the squares of the...

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  17. Standard deviation of first 'n' natural numbers is

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  18. The variance of the first 50 even natural numbers is

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  19. The median and S.D. of a distribution are 20 and 4 respetively. If eah...

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  20. The standard deviation of 26, 27, 31, 32, 35 is

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