The average height of $50$ students is $152$ cm. Ten students of average height $148$ cm leave and ten new students of average height $150$ cm join. The new average height is:
Practice this question from Chapter Mock 6: Average and Ages, with options and an explanation.
Question
The average height of $50$ students is $152$ cm. Ten students of average height $148$ cm leave and ten new students of average height $150$ cm join. The new average height is:
Option A
151.8 cm
Option B
152.0 cm
Option C — Correct answer
152.4 cm
Correct choice.
Option D
153.2 cm
Explanation
Original total $=50\times152=7600$. New total $=7600-1480+1500=7620$. New average $=7620\div50=152.4$ cm.