Suppose 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 there are equal number of males and females.

Suppose that 5 men out of 100 and 25 women out of thousand are colour blind.A colour blind person is chosen at random.What is the probability of this being male (assuming that males and females are in equal proportion).

A committee of two persons is selected from two men and two women. What is the probability that the committee will have two men?

A committee of two persons is selected from two men and two women. What is the probability that the committee will have one man?

There are 18 balls numbered from 1 to 19 in a bag.If a person selects one at random what is the probability that the number printed on the ball be an even number greater than 9?

From the employees of a company, 5 persons are selected to represent them in the managing committee of the company. Particulars of five persons are as follows: A person is selected at random from this group to act as a spokesperson. What is the probability that the spokesperson will be either male or over 35 vears?

Suppose that the reliability of a HIV test is speciflẹd as follows: Of people having HIV '90 %' of the test detect the disease but '10 %' go undetected. Of people free of HIV, '99 %' of the test are judged HIV-ive but '1 %' are diagnosed as showing HIV+ịve. From a large population of which only '0.1 %' have HIV, one person is selected at random, given the HIV, test, and the pathologist reports him/her as HIV+ive. What is the probatility that the person actually has HIV?

If birth to a male child and birth to a female child are equal-probable, then what is the probability that at least one of the three children born to a couple is male ? a) 4/5 b) 7/8 c) 8/7 d) 1/2

In a school, total number of students in 10 A division is equal to the total number of students in 10 B. One students is to be selected from each division. Number of boys in 10A is 20. The probability of selecting a boy from 10 A is 2/5 and that of from 10 B is 3/5 . What is the probability of both the selected students being boys?