# RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18A in Chapter 18 - Mean Median And Mode Of Ungrouped Data

Question 16 Mean Median And Mode Of Ungrouped Data Exercise 18A

The mean weight of a class of 36 students is 41kg. If one of the students leaves the class then the mean is

decreased by 200g. Find the weight of the student who left.

It is given that

Mean weight of 36 students = 41kg

So the total weight = 41 (36) = 1476kg

It is given that if one of the students leaves the class then the mean is decreased by 200g

So the new mean = 41 – 0.2 = 40.8kg

We get the total weight of 35 students = 40.8 (35) = 1428kg

So the weight of student who left = total weight of 36 students – weight of 35 students

By substituting the values

Weight of the student who left the class = 1476 – 1428 = 48kg

Therefore, the weight of the student who left is 48kg.

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