4 The mean of 72 items was found to be 6 c If two of the items were misrecorded as 27 and 9 instead ...........

Quantitative Aptitiude (CLAT) Permutation & Combination

4 The mean of 72 items was found to be 6(c) If two of the items were misrecorded as 27 and 9 instead of 72 and 90 respectively, find the correct mean.

64.75

64.25

63.25

65.75

Explanation:

Mean of 72 = 63
Sum total = 72*63 = 4536
two values were mis-recorded as 27 & 9 instead of 72 & 90
Hence corrected sum = 4536 - (27+9) + (72+90) = 4662
Corrected mean = 4662/72 = 64.75