Question

the mean weight of 16 students of a school is 40 kg. if a student weighing 25 kg leaves the school find mean weight of the remaining class

Answer 1

15 Kg........ will be the ans

Answer 2

The mean weight of the remaining class is 41

Step-by-step explanation:

$Average = \frac{\text{Sum of all observations}}{\text{No. of observations}}$

The mean weight of 16 students of a school is 40 kg

40 = \frac{\text{Sum of weights of 16 students}}{16}

40 \times 16 = \text{Sum of weights of 16 students}

640= \text{Sum of weights of 16 students}

A student weighing 25 kg leaves the school

New sum = 640-25 = 615 kg

No. of students = 16-1 =15

New mean =$\frac{615}{15}$

New mean = 41

Hence The mean weight of the remaining class is 41

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