Practice Test Discussion

The average height of 13 girls in a class is $144 \frac{8}{3}$ cm. The averages height of 11 boys in the $169 \frac{5}{11}$ cm. There are only 24 students in the class, What is the overall average height of all the students together in the class?

$156 \frac{3}{4}$

156

153

$153 \frac{3}{5}$

None of these

Explanation

Sum of the total height of 13 girls in the class = $13 \times \frac{1880}{13}$

= 1880 cm

Sum of the total height of 11 boys in the class = $11 \times \frac{1864}{11}$

= 1864 cm

∴ Overall average height = $\frac{1880 + 1864}{24}$ =156 cm

Hence, Option B is correct.

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