Posted by **Mich Mich** on Friday, March 25, 2011 at 3:04pm.

A manufacturing company has 5 identical machines that produce nails. The probability that a machine will break down on any given day is .1. Define a random variable X to be the number of machines that will break down in a day.

a. what is the appropriate probability distribution for X? Explain how X saisfies the properties of the distribution.

b. compute the probability that 4 machines will break down.

c. compute the probability that at least 4 machines will break down.

d. what is the expected umber of machines that will break down in a day?

e. What is the variance of the number of machines that will break down in a day?

## Answer this Question

## Related Questions

- Markov chains - A company has 2 machines. On any day, each machine that is ...
- Intro to Probability - Widgets are produced at a certain factory by each of ...
- MATH - A company makes three products X, Y and Z. Each product requires ...
- MATH- please help! - A company makes three products X, Y and Z. Each product ...
- MATH-PLEASE HELPPP!!!! - A company makes three products X, Y and Z. Each product...
- math- im really confused! please help!! - A company makes three products X, Y ...
- algebra - Machine A produces nails at a uniform rate of 60 every 20 seconds and ...
- Math - A factory has 3 machines that produce the same item. Machines 1 and 2 ...
- Pre-Cal - The total cost (in thousands of dollars) of a machine manufacturing ...
- stats - Question Part Points Submissions Used The number of ships to arrive at ...

More Related Questions