The average height of 20 students of class 9 is 147 cm and the average height of 15 students of class 10 is 154 cm. What is the average height (in cm) of the two class?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 150.
Total height of class 9 = 20 × 147 = 2940 cm
Total height of class 10 = 15 × 154 = 2310 cm
Combined total = 2940 + 2310 = 5250 cm
Total students = 20 + 15 = 35
Average = 5250 / 35 = 150 cm