A box contains 50 light bulbs, 5 of which are defective. If a sample of 4 lightbulbs is randomly selected without replacement. Find: a) The probability mass function of the number of defective bulbs. b) The probability that less than two bulbs are defective.
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Therefore, the probability of selecting a non-defective bulb on the first draw is 45/50 = 9/10. Let X be the number of defective bulbs in the sample of 4 bulbs. The probability mass function for X is: P(X = 0) = (45/50) * (44/49) * (43/48) * (42/47) P(X = 1) = Show more…
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