Question

The average number of runs of a player in 12 innings is 64. How many runs must he make in his next innings so that total average increase by 2?
1. 82
2. 78
3. 88
4. 90

Answer 1

Correct Answer - Option 4 : 90

Given: The average number of runs of a player in 12 innings is 64.

Formula: Average of n numbers a1, a2, ... an = (a1 + a2 + ... + an)/n

Calculation: suppose he make x runs in the 13^th innings

(12 × 64 + x)/13 = 66

⇒ 12 × 64 + x = 66 × 13

⇒ 768 + x = 858

⇒ X = 90