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The weekly amount spent by a company for travel has an approximately normal distribution with mean...

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40.

(a) What is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks)

(b) What is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?

Math   Statistics-And-Probability   
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