Thread: Please help

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Originally Posted by Jon

A machine is producing parts that on average have a .05 probability of being defective. If a random sample of 5 parts is selected and each part is tested, finding the following probabilities:

getting exactly 1 defective part
getting no defective part
getting at most 1 defective part
getting at least 1 defective part
getting 5 defective parts

Use the formula:
If the probability of an event is then the probability of that event happening out of times is,


In the problems when they are for at most. You need to add up all the probabilities. For example, at most 3: which means probability of exactly 0 plus probability of exactly 1 plus probability of exactly 2 plus probability of exactly 3.

The same with at least only in the other direction.