Mrs. Jones surveys her class of 20 students about their siblings. In the class, 15 have a brother, 16 have a sister, and 12 have

Question

Katarina [22]

4 years ago

12

Mrs. Jones surveys her class of 20 students about their siblings. In the class, 15 have a brother, 16 have a sister, and 12 have

both a brother and a sister. What is the probability that a student has a brother OR a sister?

Mathematics

2 answers:

ryzh [129] · Answer 1 · 2022-01-24T13:23:10+03:00

ryzh [129]4 years ago

5 0

P(Brother or Sister) = .75 + .82 - .65 P(Brother or Sister) = .92 = 92% The reason you subtract the .65 is that scenario does not fit the rule. The rule is the probability of having a brother OR a sister. The .65 represents the kids who have both not either.

Masteriza [31] · Answer 2 · 2022-01-24T14:37:38+03:00

Masteriza [31]4 years ago

4 0

About 10 % of people might have a brother or sister