In computing the mean of 8 numbers, a boy mistakenly used...
In computing the mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers and obtained 20 as the mean. Find the correct mean
19
21
23
24
Correct answer is B
Mean=sumofitemstotalnumberofitems
20=x8⟹x=160
The sum of the 7 nos = 160 - 17 = 143
Correct mean = 143+258=1688=21
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