A civil engineer is studying a left-turn lane that is lo
Question and Solution
A civil engineer is studying a left-turn lane that is long enough to hold seven cars. Let X be the number of cars in the
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A civil engineer is studying a left-turn lane that is long enough to hold seven cars. Let X be the number of cars in the lane at the end of a randomly chosen red light. The engineer believes that the probability that X = x is proportional to (x + 1)(8 ? x) for x = 0,..., 7 (the possible values of X). a. Find the p.f. of X. b. Find the probability that X will be at least 5.
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