Question

9) What is the probability of being born in July and on a day that is amultiple of 3?

Answer 1

It is important to know that July has 31 in total.

The probability of being born in July is

`P=(1)/(12)`

The probability of being born on a day that is multiple of 3 is

`P=(9)/(31)`

Because there are 9 days which are multiple of 3.

Then, we sum both probabilities.

`P=(1)/(12)+(9)/(31)=(31+108)/(372)=(139)/(372)\approx0.37`

Hence, the probability is 0.37, or 37%, approximately.