Question

the mean marks of a class of 25 students is 52.4 . Later the teacher noticed that one student marks was wrongly written as 64 instead of 46 . find the correct mean​

Answer 1

Answer:

51.68

Step-by-step explanation:

The mean mark of 25 students is 52.4

Then, the sum total marks of the class of 25 students is

$25*52.4=1310$

when the teacher removes the wrong mark the total for the remaining 24 students is

$1310-64=1246$

When the teacher re-enters the correct mark, the total marks for the 25 students becomes;

1246+46=1292

The new average is then given as

1292/25=51.68

Answer 2

51.68

Step-by-step explanation:

The mean mark of 25 students is 52.4

Then, the sum total marks of the class of 25 students is

25*52.4=131025∗52.4=1310

when the teacher removes the wrong mark the total for the remaining 24 students is

1310-64=12461310−64=1246

When the teacher re-enters the correct mark, the total marks for the 25 students becomes;

1246+46=1292

The new average is then given as

1292/25=51.68