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Mean of 100 items is 49. It was discover...

Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively.The correct mean is

A

48

B

`82(1)/(2)`

C

50

D

80

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Exercise - I
  1. In a data the number I is repeated I times for i=1, 2, …,n. Then the m...

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  2. The mean of 10 observations is 16.3. By an error one observations is r...

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  3. Mean of 100 items is 49. It was discovered that three items which shou...

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  4. The mean weight of 9 items is 15. If one more items is added to the se...

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  5. Consider the frequency distribution of the given number If the me...

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  6. Mean of the numbers 1,2,3,…,n with respective weights 1^(2) + 1, 2^(...

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  7. The mean of n items is bar(x). If the first item is increased by 1, se...

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  8. The number of observation in a group is 40. If the average of first 10...

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  9. Mean of a set of numbers is bar(x). If each number is increased by lam...

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  10. The median of 5,19,14,6,8,9,12,13,21 is

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  11. The median of a set of 9 distinct observations is 20.5. If each of the...

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  12. Median of (x)/(5), x, (x)/(4), (x)/(2), (x)/(3) is 8. If x gt 0 then v...

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  13. The mean and median of 100 items are 50 and 52 respectively. The value...

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  14. Mode of the data 3,2,5,2,3,6,6,5,3,5, 2, 5 is

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  15. Mode of the following distribution is

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  16. If the difference between mean and mode is 63, then difference between...

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  17. If the mode of the data 25,15,20,25,18,14,15,18,16,20,25,20,x,18 is 25...

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  18. A data consists of two 2's, four 4's, six 6's three 8s', and 10. Then ...

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  19. The average value of the median of 2,8,3,7,4,6,7 and the mode of 2,9,3...

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  20. Geometric mean of 2, 2^(2), 2^(3),…,2^(n) is

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