Page 2 - Lession note - stat chap -9,MCT (AM)-51
P. 2
The mean weight of 150 students in a class is 60 kg. The mean of the boys in the
class is 70kg and the girls is 55kg. Find the number of boys and girls in the class .
Ans ; - Boys 50, Girls 100
Example 5:-
The mean weight of 25 students in a class is 52 kg . it was later discovered that one
weight was misread as 45 kg instead of 54kg. Calculate the correct average weight.
Ans: 52.35 kg
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