# Help with Probability?

1. In New England, 75% of the houses have a garage, 12% of the houses have a backyard and 45% of the houses have a garage and a backyard. What is the probability that a house has a backyard given that it has a garage.

The possible answers are 3/5, 3/8, 5/3 and 2/7

2. In a survey, 70% of people say that they read books, 25% of people say that they watch movies and 20% of people say that they watch movies and also read books. What is the probability that a person watches movies, given that he also reads books.

The possibilities are 2/7, 4/5, 7/4, and 1/7.

3.You are asked to roll an 8-sided die. Event A is rolling a Number multiple of 2, and event B is rolling a number multiple of 4. Find P(A,B)

The possibilities are 1/1, 5/6, 1/4, 1/5

4. You are asked to roll a six-sided die. Event A is rolling an odd number, and event B is rolling a prime number. Find the probability of rolling a prime number given the number you rolled is an odd number.

The possibilities are 2/3, 7/6, 3/4 and 1/2.

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• 8 years ago