The mean weight of 25 students of a class is 52kg. If the mean weight

1.	The mean weight of 25 students of a class is 52kg. If the mean weight of the first 13 students of the class is 48kg and that of the last 13 students is 55kg, find the weight of the 13th student.
Answer» It is given that Mean weight of 25 students = 52kg So the total weight = 25 (52) = 1300kg Mean weight of first 13 students = 48kg So the total weight = 13 (48) = 624kg Mean weight of last 13 students = 55kg So the total weight = 13 (55) = 715kg We know that Weight of 13^th student = total weight of the first 13 students + total weight of last 13 students – total weight of 25 students By substituting the values Weight of 13^th student = 624 + 715 – 1300 On further calculation Weight of 13^th student = 39kg Therefore, the weight of the 13^th student is 39kg.

The mean weight of 25 students of a class is 52kg. If the mean weight of the first 13 students of the class is 48kg and that of the last 13 students is 55kg, find the weight of the 13th student.

Answer»

It is given that

Mean weight of 25 students = 52kg

So the total weight = 25 (52) = 1300kg

Mean weight of first 13 students = 48kg

So the total weight = 13 (48) = 624kg

Mean weight of last 13 students = 55kg

So the total weight = 13 (55) = 715kg

We know that

Weight of 13^th student = total weight of the first 13 students + total weight of last 13 students – total weight of 25 students

By substituting the values

Weight of 13^th student = 624 + 715 – 1300

On further calculation

Weight of 13^th student = 39kg

Therefore, the weight of the 13^th student is 39kg.

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