The mean of 5 observations is 89. If one of the observations is wrongly taken as 64 instead of 46, find the
correct mean.
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mean of 5 observation=89
sum of 5 observation=89×5=445
if we subtract wrong Number=445-42=403
Real Number,when added=403+24=427
Correct mean=427÷5
=85.4 answer
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