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If 6,5,8 and 3 occur with frequencies 4,...

If 6,5,8 and 3 occur with frequencies 4,2,5 and 1 respectively, then the arithmetic mean is

A

6.15

B

6.35

C

6.25

D

6.45

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Practice Exercise
  1. The mean of marks obtained in an examination by a group of 100 student...

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  2. If 5 is added to each and every item of a data, then the A.M. is

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  3. If 6,5,8 and 3 occur with frequencies 4,2,5 and 1 respectively, then t...

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  4. The mean of 20 observations is 15. On Checking it was found that two o...

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  5. Mean of 100 observation is 45. It was later found that two observation...

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  6. Mean of 10 numbers is 6. It was later observed that one number was mis...

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

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  8. The mean weight of 150 students in a certain class is 60 kilograms. Th...

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  9. The mean age of a combined group of men and women is 30 years. If the ...

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  10. The mean of a set observations is bar(x). If each observation if divid...

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  11. If the mean of a set of observations x(1), x(2),….,x(10) is 20 then th...

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  12. The A.M. of the series .^(n)C(0), .^(n)C(1), .^(n)C(2),….,.^(n)C(n) ...

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  13. The mean of first three items is 14 and mean of next two items is 18. ...

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  14. Six faces of a balanced die are numbered from integers 1 to 6. This di...

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  15. The A.M. of set of 50 numbers is 38. If two numbers of the set, namely...

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

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

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

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

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

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