Question:
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 this person being male? Assume that there are equal number of males and females.
Answer:
Given that 5% of men and 0.25% of women have grey hair.
So, percentage of people with gray hair = 5% + 0.25% = 5.25 %
Now probability that selected person is a male = 5/5.25
= (5*100)/525
= (5*4)/21 (100 and 525 is divided by 25)
= 20/21
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