Question

The average weight of 32 students of a class was 58.5 kg. After 8 new students joined the class, its average weight increased by 1.2 kg. What is the average weight of 8 new students who joined the class? (in kg)

Options

• 62.5

• 64.5

• 65

• 63

Answer 1

64.5

Explanation:

Sum of the weights of 8 new students = `(40 xx (58.5 + 1.2) - 32 xx 58.5)` kg

= `(40 xx 59.7 - 32 xx 58.5)` kg

= `(2388 - 1872)` kg

= 516 kg

∴ Required average weight = `516/8` = 64.5 kg.