20. Mean value of the weekly income of 40 families is 265. But in the

1.	20. Mean value of the weekly income of 40 families is 265. But in the calculation, income of onefamily was read as? 150 instead ofAns, 264.125]115. Find the 'Corrected' mean.
Answer» Wrongly stipulated sum was 265 x 40= 10600 Subtract the wrong value and add the correct income value to get the correct sumCorrect sum= 10600- 150+ 115 = 10565 Correct mean= 10565/40= 264.125

20. Mean value of the weekly income of 40 families is 265. But in the calculation, income of onefamily was read as? 150 instead ofAns, 264.125]115. Find the 'Corrected' mean.

Answer»

Wrongly stipulated sum was 265 x 40= 10600

Subtract the wrong value and add the correct income value to get the correct sumCorrect sum= 10600- 150+ 115 = 10565

Correct mean= 10565/40= 264.125