Question

The mean height of 20 boys and 14 girls is 161 cm. The mean height of 14 girls is 151 cm. Find the sum of the heights of 14 girls.

Answer 1

21.14 m

Explanation:

the mean is calculated as

mean =
`(sum)/(count)`

here mean is 151 cm and count = 14 , then

`(sum)/(14)` = 151 ( multiply both sides by 14 to clear the fraction )

sum = 14 × 151 cm = 2114 cm = 2114 cm ÷ 100 = 21.14 m

Answer 2

Answer: 2114

Explanation:

m = sum of the terms / number of terms

151 = a/ 14

14 x 151 = a

2114 = a