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Probability Question

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Intern
Joined: 30 Sep 2012
Posts: 3
Location: Australia
WE: Information Technology (Energy and Utilities)

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19 Apr 2014, 06:37
Hi Guys

I need some help with a question below:
Three workers produce a certain part at the same rate .Joe averages 2 defective parts per hundred.Mary averages 5 defective parts per hundred.Harold averages 8 defective parts per hundred.The defective parts are identified by quality control and set aside in a rework pile.

How many defective parts do you expect there to be out of 1000 parts produced?

What is the probability that a randomly selected part in the rework pile was produced by Mary?
Probability Question   [#permalink] 19 Apr 2014, 06:37
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