Asked by sania

A graduate class consist of six students. what is the probability that exactly three of then are born in either in april or in october?

Answers

Answered by Steve
the size of the class does not matter. Assuming a random population,

P(April)=P(Oct) = 1/12

P of 3 students all in same month is thus (1/12)^3

Given two months, p is twice that.

so, the probability here is 2*(1/12)^3
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