Question

The average marks of 100 students are given to be 40. It was found later that marks of one student were 53 which were misread as 83. The corrected mean marks are

Answer 1

Step-by-step explanation:

Average marks of 100 students = 40 Total sum of all marks of 100 marks=40×100 = 4000. It was found that marks of one student were 53 which were misread as 83. Hence there is reduction of 30 marks thus the corrected mean marks =(4000-30)/100 =

3970/100 =39.70. Hope it helps you.

Answer 2

Answer:39.7

Step-by-step explanation:For.(A=s/n)

100=S/40

100*40=S

S=4000

(83-53).....30marks extra misread

4000-30=3970

So ,correct mean

3970/100=39.70

Ans.=39.70