Question

A survey of the local neighbourhood showed that 15% of the population was under 12 years old and 25% of the population was over 60 years What is the probability that a person selected at random was between 12 years old and 60 years old?

• A. $\frac{3}{5}$
• B. $\frac{2}{5}$
• C. $\frac{1}{4}$
• D. $\frac{3}{20}$

Answer 1

The correct option is A $\frac{3}{5}$

The percentage of population between 12 years old and 60 years old is $(100-(15+25))$%=60%
$\therefore$ Required probability $=\frac{60}{100}=\frac{3}{5}$