# Math Statistics

Suppose you work for the quality control department at Hewlett Packard. You know that ink jet cartridges are sometimes defective. The current defective rate is 8 cartridges per package of 100 (i.e. 0.08) What is the probability of sampling 12 cartridges and finding:

At least 4 are defective:
Exactly 1 is defective:
2 or more, but less than 5 is defective:

These are the main ones I'm unsure on, any help would be greatly appreciated.

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1. check the original response

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posted by scott
2. I'm sorry but I just don't understand.

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posted by Jaz
3. each term is the probability of that specific outcome

n^x d^y means x were not defective and y were defective
... in this problem , x + y = 12

at least 4 defective means the sum of the terms where 4 or more were defective

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posted by scott

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