B. The number of television sets coming off a production line each day is known to have a standard deviation of 117.4 sets per day. The production manager tells you that the 95% confidence interval for the population mean was 552.3 to 621.9. How large of a sample was this confidence interval based on?

C. The weight of newspaper generated for garbage per month by each household in a particular community follows a normal distribution with a mean of 28 pounds and a standard deviation of 5 pounds. If a household is selected at random from this community, find the probability that it generates above 35 pounds of newspaper for garbage in the next month?