Q. 3  Suppose that $\inline 5^{o}/_{o}$ of men and  $\inline 0.25^{o}/_{o}$  of women have grey hair. A grey haired person is selected at random. What is the probability of this person being male? Assume that there are equal number of males and females.

S seema garhwal

We have  $\inline 5^{o}/_{o}$ of men and  $\inline 0.25^{o}/_{o}$  of women have grey hair.

Percentage of people with grey hairs $=(5+0.25)\%=5.25\%$

The probability that the selected haired person is male :

$=\frac{5}{5.25}=\frac{20}{21}$

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