Question

mean value of the weekly income of 40 families in 265.but in the calculation income of one family was read as 150 instead of 113 .find the correct mean

Answer 1

mean income of 40 families =265
sum of income of 40 families =40×265=10600
when it is mis read as 150 instead of 113,then the correct sum will be =10600-150+113=10563
the correct mean =10563/40=264.0615 (approx)