# Probability concepts for Dr. Stallter

Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems. She has also determined that among those who do their assignments, 90 percent will pass the course. Among those students who do not do their homework, 60 percent will pass. Mike Fishbaugh took statistics last semester from Dr. Stallter and received a passing grade. What is the probability that he completed the assignments?

One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen, but only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?

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Problem Sets - Descriptive Statistics and Probability Distributions

Use Bayes' theorem to determine

Answer: P(B1)=P(B1/A1)*P(A1)+P(B1/A2)*P(A2)+P(B1/A3)*P(A3) 0.110

P(A3 and B1)=P(B1/A3)*P(A3) 0.04

P(A3/B1)=P(A3 and B1)/P(B1) 0.363636364

A Survey of Probability Concepts

Ch. 5 36 Dr. Stallter has been teaching basic statistics for many years. She knows ...

#### Solution Summary

The probability that Dr. Stallter has completed the assignments is given. Probability concepts are examined.