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Mathematics 8 Online
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.

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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