In a game there are 70 people in which 40 are boys and 30 are girls, out of which 10 people are selected at random. One from the total group, thus selected is selected as a leader at random. What is the probability that the person, chosen as the leader is a boy?
A. 4/7
B. 4/9
C. 5/7
D. 2/7
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Answer: A. 4/7
Step-by-step explanation:
The total groups contains boys and girls in the ratio 4:3
If some person are selected at random from the group, the expected value of the ratio of boys and girls will be 4:3
If the leader is chosen at random from the selection, the probability of him being a boy = 4/7
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