Question

30. The average age of 20 boys is 15.

Answer 1

Answer:

D. 300 years

Step-by-step explanation:

Mean = $\frac{sum of observations}{no. of observations\\}$

Here we know the mean which is 15 and the number which is 20

Total age = 15 × 20

Total Age = 300 years

Answer 2

Answer:

D. 300 Years is the correct answer.

Step by Step Explanation:

20×15= 300