Iwon $60,000 i invested part in a cd at 2% interest the rest at 3%interest in a cd at the end of the year i earned $1600 in interest. how much did i invest in each cd

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?