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Help i will have more questions

Help i will have more questions-example-1

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Answer:

3/23 or 0.1304 or 13%

Explanation:

Given 3 students have a brother and sister, and 20 students have only a brother, you want the probability that a student who has a brother also has a sister.

Conditional probability

The conditional probability formula is ...

P(A | B) = P(A&B)/P(B)

Here, this means ...

P(has a sister | has a brother) = P(has both)/P(has a brother)

= 3/(3 +20)

= 3/23 ≈ 0.1304 ≈ 13% . . . . . probability of a sister if has a brother

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User Darien Miller
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