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    Random Variables and Probability : Sampling Without Replacement

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    A carton of 30 lightbulbs includes 5 defective ones. If 4 light bulbs are drawn at random (without replacement), what is the probability that;

    (a) 2 of the selected light bulbs are defective.
    (b) Not all the selected light bulbs are defective.

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    Solution Summary

    Sampling Without Replacement and defective light bulbs are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.