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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asked by Jaz
  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

    answers for these three were covered in your 1st posting

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    posted by scott

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