Probability of Occurance
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A person purchases a package of 10 ball-point pens which, unknown to the purchaser, contains 4 defective pens. Of the first 2 pens used by the purchaser, find the probability that at least 1 pen is defective.
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Solution Summary
This solution calculates the probability that one will pick up a defective pen from a package of 10.
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There is no need to use Excel for this one.
There are 10 pens in the box and 4 of them are defective. That means 4 out of 10 pens are defective, or 4/10, or 40%.
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