Question

Mean of weights of a 9 students is 40 kg . 1 student left whose weight was 48 kg then mean of remaining student is ___
A) 40
B) 39
C) 44
D) 46

Answer 1

Step-by-step explanation:

Given that :

Mean of weight of 9 students = 40 kg

we have to find :

Mean of weight of remaining 8 students when a student of 48 kg left the class

we know that:

Mean = sum of all the observations / no. of observations

Here ,

sum of weight of 9 students = Mean × 9

= 40 × 9 = 360 kg

Now,.

sum of weight of 8 students

= 360 - 48 = 312 kg

Now,

Mean (8 students) = 312 / 8 = 39

=> Mean of weight of remaining 8 students = 39 kg Answer

Hope it helps... :-)