Question 59

The average age of 12 boys is 15 years and the average age of 18 girls is 12 years. What is the combined average age of the boys and girls, taken together?

Solution

Avg1 = $$\frac{sum of no}{no. Of term}$$

15 =$$\frac{sum of no.}{12}$$

Sum of no. =180

Avg2= $$\frac{sum of no}{no. Of term}$$

12 =$$\frac{sum of no.}{18}$$

Sum of no. =216

Combined avg =

$$\frac{180+216}{no. Of term}$$

Combined avg =$$\frac{396}{30}$$

= 13.2

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