Question

the arithmetic mean of 100 iteam +45 later on it was found that 2 iteam 35,32 were misread as 53,23 respectively. Also the no. of iteam were 90 and not 100 compute the correct mean.

Answer 1

Total = 45*100
take away 53 and 23 and put in 35 and 32
4500 - 53 - 23 + 67 = 4500 -9
now no . of items = 90
(4500-9)÷90
= 50 -0.1
= 49.9

Answer 2

answer is 49.9
as ,50 -0.1 =49.9