Posted by **Brad** on Thursday, May 17, 2012 at 10:59pm.

A package contains 12 resistors, 3 of which are defective. If four are selected, find the

probability of getting the following.

No defective resistors

One defective resistors

3 defective resistors

- Probability and Statistics -
**PsyDAG**, Friday, May 18, 2012 at 2:19pm
Assuming no replacement,

The probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

None defective = 9/12 * 8/11 * 7/10 * 6/9 = ?

One defective = 3/12 * 9/11 * 8/10 * 7/9 = ?

Three defective = 3/12 * 2/11 * 1/10 * 9/9 = ?

- Probability and Statistics -
**Bibi**, Monday, April 28, 2014 at 11:55am
a record company claims that of 55 000 cd's produced 15% will be defective, 100 were defective. is the company right?

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