Homework Answers
Answer 10 :
A fish tank in a pet store has 15 fish in it. 11 are orange and 4 are white. Determine the probability that if we select 3 fish from the tank, at least 2 will be white.
Solution :
Total fish = 15
Orange fish = 11
White fish = 4
P(Atleast 2 out of 3 will be white)
= P(2 white) + P(3 white)
= (4C2 * 11C1) + (4C3 * 11C0) / 15C3
= (6*11 + 4*1) / 455
= (66 + 4)/455
= 70/455
= 0.1538
Therefore option a) is correct answer.
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