Question

In a class of 32 students

the mean height of the 14 boys is 1.56 metres
the mean height of all 32 students is 1.515 metres.
Work out the mean height of the girls.

Answer 1

1.48 m.

Explanation:

The number of girls in the class = 32 - 14 = 18 girls.

Sum of the boy's heights = 14 * 1.56 = 21.84 m.

Sum of all the student's heights = 32 * 1.515 = 48.48 m.

So the sum of the heights of the girls is 48.48 - 21.84

= 26.64 m.

So the mean height of the girls 26.64 / 18

= 1.48 m.