Question

in a class of 32 students the mean height of the 14 boys is 1.56 metres the mean height of the 32 students is 1.515 metres work out the mean height of the girls show your working out

Answer 1

1.515 = 14* 1.56 + 18*x/(32)

0r, 18x= 1.515*32 - 14*1.56

or, 18x= 26.64

x= 1.48

Explanation:

Answer 2

mean height of girls = 1.48 m

Explanation:

Find the sum height of 32 students.

Sum of the height of 32 students = 32 * mean of 32 students

= 32 * 1.515

= 48.48 m

Sum of the height of 14 boys = 14 * mean of 14 boys

= 14 * 1.56

= 21.84

Number of girls = 32 - 14 = 18

Sum of the height of 18 girls = 48.48 - 21.84 = 26.64 m

Average of the height of 18 girls = 26.64 ÷ 18

= 1.48 m