Another survey shows that 95%of the group of 60 students spend more than 200 minutes per day using the Internet. Compare the group of teenagers to the group of retired people in terms of internet usage. Your answer should contain a comparative figure and a summarising comment.

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?