Asofa sold at four different stores has a retail price of $1,200. each store is offering a different promotion. store a: 10% off sale store b: $100 off coupon store c: $75 off coupon store d: $150 rebate which offers the best deal?

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?