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The simple and weighted arithmetic mean ...

The simple and weighted arithmetic mean of the first n natural numbers, the weights being the corresponding numbers is

A

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

B

`(n+1)/(2), (2n+1)/(4)`

C

`(n+1)/(2), (2n+1)/(3)`

D

`n, n^(2)`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Practice Exercise
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  2. The A.M. of set of 50 numbers is 38. If two numbers of the set, namely...

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  3. The simple and weighted arithmetic mean of the first n natural numbers...

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  4. The average salary of male employees in a firm was RS. 520 and that of...

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  5. The median of 25, 14, 11, 26, 18 , 17, 40, 29, 19, 20, 13 is

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  6. The median of 111, 129, 143, 118, 120, 125, 170, 162 is

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  7. The median of the following items 25,15,23,40,27,25,23,25 and 20 is

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  8. The test marks in statistic for a class are 20,24,27,38,18,42,35,21,44...

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  9. The mean of two samples of sizes 200 and 300 were found to be 25, 10 r...

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  10. The median of a series is 10. Two additional observations 7 and 20 are...

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  11. The mean and standard deviation of 20 items is found to be 10 and 2 re...

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  12. If in a moderately skewed distribution, the values of mode and mean ar...

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  13. The mode of a set of observation 7, 12,8,5,6,4,9,10,8,9,7,6,5,9 is

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  14. The mode of 3,3,7,4,5,3,5,6,8,9,5,3,5,3,6,9,7 ,4 is

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  15. For data 4,5,5,7,6,6,3,2,5,7,6,7 the number of modes is

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  16. Mode of 12,14,11,16,15,14,11,13,14 is

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  17. In a moderately skewed distribution, the values of mean and median are...

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  18. The geometric mean of observation 2,4,16 and 32 is

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  19. The geometric mean of 5,8,10,15,20,25,30,35 is

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  20. The men deviation of first 7 natural numbers from mean is

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