# 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.

https://brainmass.com/math/probability/random-variables-probability-sampling-replacement-58586

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A carton of 30 lightbulbs includes 5 ...

#### 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.

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