Suppose that 5% of men and 0.25% of women have grey hair. A grey haired person is selected at random. What is the probability of these person being male? Assume that there are equal number of males and females.

Explanation

We know that `5 %` of men and `0.25 %` of women have grey hair.


So , percentage grey hair person `=(5+0.25) %=5.25 %`


`therefore` Probability selected haired person is a male `=frac{5}{5.25}=frac{20}{21}`