18. A softdrink machine can be regulated so that it discharges an average of
cup. If the ounces of fill are Normally distributed with a standard deviation of 0.4 oz,
what value should
be set at so that 6-oz cups will overflow only 2% of the time?
19. A consumer group surveyed the prices for white cotton extra-long twin sheet sets in five
different department stores and reported the average price as $16.
We visited four of
the five stores, and found the prices to be $12, $15, $17, and $22.
Assuming that the
consumer group is correct, what is the price of the item at the store that we did not visit?