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OpenStudy (anonymous):
if the probability that on any work day a garage will get 10-20, 20-30, 30-40, over 40 cars to service is 0.20, 0.35, 0.25, 0.12 respectively. what is probability that on a given work day the garage gets at least 21 cars to service.
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OpenStudy (amistre64):
at least 21 has a complement: 1 - at most 20
OpenStudy (amistre64):
20 35 25 12 ---- 82 looks like 0-10 is .18
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