# 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 15 Mean Median And Mode Of Ungrouped Data Exercise 18A

The mean weight of a class of 34 students is 46.5kg. If the weight of the teacher is included, the mean

rises by 500g. Find the weight of the teacher.

It is given that

Mean weight of 34 students = 46.5kg

So the total weight = 34 (46.5) = 1581kg

We know that

Mean weight of 34 students and teacher = 46.5 + 0.5 = 47kg

So the total weight of 34 students and teacher = 47 (35) = 1645kg

The weight of teacher = Weight of 34 students and teacher – total weight

By substituting the values

Weight of the teacher = 1645 – 1581 = 64kg

Therefore, the weight of the teacher is 64kg.

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