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The mean of the marks scored by 50 stude...

The mean of the marks scored by 50 students was found to be 39 later on, it was observed that a score was 43 was misread as 23 find the correct mean.

A

38.6

B

39.4

C

39.8

D

39.2

Text Solution

Verified by Experts

The correct Answer is:
B
calculated sum =` ( 39 xx 50) = 1950`
correct sum = ( 1950 +43-23) =1970
Correct mean = `1970/50 = 39.4`
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RS AGGARWAL-MEAN , MEDIAN AND MODE OF UNGROUPED DATA -Multiple Choice Questions (Mcq)
  1. If the mean of five observations x ,\ x+2,\ x+4,\ x+6,\ x+8\ i s\ 11...

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  2. If the mean of the observation x, x+3, x+5, x+7 and x+10 is 9, then me...

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  3. if overlinex is the mean of x(1),x(2),x(3),….,x(n) " then "sum(n)^(i=1...

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  4. If each observation of the data is decreased by 8 then their mean

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  5. The mean weight of 6 boys in a group is 48 kg. the individual weight o...

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  6. The mean of the marks scored by 50 students was found to be 39 later o...

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  7. The mean of 100 items was found to be 64. Later on it was discovered t...

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  8. The mean of 100 observation is 50. If one of the observation which was...

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  9. Let barx be the mean of x(1), x(2), ………, x(n) and bary be the mean of ...

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  10. If barx is the mean of x(1), x(2), …………., x(n), then for a ne 0, the m...

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  11. If barx(1), barx(2), barx(3),………barx(n) are the means of n groups with...

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  12. The mean of the following data is 8. Then, the value of p is

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  13. The runs scored by 11 members of a cricket team are 15,34,56,27,43,...

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  14. The weight of 10 students (in kg) are 55,40,35,52,60,38,36,45,31,44....

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  15. The median of the numbers 4,4,5,6,7,7,12,3,12 is

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  16. The median of the numbers 84,78,54,56,68,22,34,45,39,54 is

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  17. Mode of the data 15,17,19,14,18,15,14,20,19,14,15,19,14 is

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  18. The median of the data arranged in ascending order 8,9,12,18,(x+2),(x+...

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