Find probability that no alternators appear defective
A batch of 20 used automobile alternators contains 4 defectives. If 3 alternators are sampled at random, find the probability of the event.
(a) A = [none of the defective appear](b) B = [exactly two defectives appear]
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Two are chosen at random and their numbers are added together. What is the probability that the resulting sum is equal to 5?
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Assume that a set of test scores is normally distributed with a mean of 78 and a standard diviation of 10. What percentage of scores lie between 78 and 97?
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