Question

the average weight of a group of 10 students was 50 kgs .it was later found that weight of a student was 54 kgs ., but it was wrongly taken as 45 kgs .find correct mean ​

Answer 1

Answer:

Difference in weight =87−78=9kg

∴ Correct average weight =89.4+

20

9

=89.4+0.45=89.85kg