Question

mean value of the weekly income of 40 families is 265 but in the calculation income of one family was read as 150 instead of 115 find the correct mean​

Answer 1

let the sum of income 40 families be x

then x/40=265

x=10600

difference in wrongly entered value 150-115=35

So we need to subtract 35 from the total income

i.e. corrected total income=10600-35=10565

Corrected mean = 10565/40= 264.125

Answer 2

Answer:

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