Homework Help: statistics

Posted by Sam on Tuesday, February 26, 2008 at 2:11am.

Use Bayes' theorem to solve this problem. A storeowner purchases stereos from two companies. From Company A, 150 stereos are purchased and 7% are found to be defective. From Company B, 900 stereos are purchased and 9% are found to be defective. Given that a stereo is defective, find the probability that it came from Company A.

Is the answer 7/61 = .11475?

statistics - drwls, Tuesday, February 26, 2008 at 7:10am
Of the defective stereos on hand, 10.5 were probably from A and 81 probably from B.

10.5/91.5 are from A. That equals 7/61.

To get the answer with Bayes' theorem,
P(y|x) = P(x|y)*P(y)/P(x)
P(x) = probability it is defective regardless of source = 91.5/1050
P(y) = probability it is from A, defective or not = 150/1050
P(x|y) = probability that it is defective, if from A = 0.07
P(y|x) = probability it is from A, if defective
= .07* (150/91.5) = .11475..

Answer this Question

Related Questions

statistics - Use Bayes' theorem to solve this problem. A storeowner ...
statistics - Use Bayes' theorem to solve this problem. A storeowner ...
algebra - Supply and demand. The supply and demand for the sale of stereos by ...
Calculus - When an electronics store prices a certain brand of stereos at p ...
Calculus - When an electronics store prices a certain brand of stereos at p ...
Accounting - A company using the periodic inventory system has the following ...
Accounting - Redmon Company uses a sales journal, a purchases journal, a cash ...
Math - The organizers of of a walkathon get cost estimates from two printing ...
Math - The organizers of of a walkathon get cost estimates from two printing ...
Anonymous - Maya is going to rent a truck for one day. There are two companies ...

For Further Reading

First Name:
School Subject:
Answer: