Question

The mean height for a sample of 59 boys is 168 cm with a variance of 74. For a sample of 74 girls, the mean height is 190 cm with a variance of 72. What is the difference in the mean heights of boys and girls?

1) 22 cm
2) 18 cm
3) 16 cm
4) 14 cm

Answer 1

The difference in the mean heights of boys and girls is 22 cm, calculated by subtracting the mean height of boys (168 cm) from the mean height of girls (190 cm).

Step-by-step explanation:

The difference in the mean heights of boys and girls is found by subtracting the mean height of boys from the mean height of girls. With the mean height of boys being 168 cm and the mean height of girls being 190 cm, the difference is calculated as:

190 cm (girls) - 168 cm (boys) = 22 cm.

Therefore, the difference in the mean heights of boys and girls is 22 cm.