Question

Some of the children at a school arrrive by car.

60% of the children at the school are boys.
20% of the boys at the school arrive by car.
60% of the girls at the school arrive by car.

What’s the probability that a child chosen at random from the school arrives by car? (Give your answer as a decimal)

Answer 1

0.36

Explanation:

Percentage of boys = 60%

Percentage of girls = 100 - 60 = 40%

Percentage of boys that arrive by car

= 20% of 60%

= 0.2 x 60 = 12%

Percentage of girls that arrive by car

= 60% of 40%

= 0.6 x 40

= 24%

Total Percentage of children arrive by car

= 12 + 24

= 36%

P(Arrive by car)

= 36%

= 0.36