Jose looked at the raw data and discovered that the 54 data values included both the city and the highway mileages for 27 cars. he used the city mileages for the 27 cars to make the histogram in figure 2-10(b). uding this information from figure 2-10, parts (a) and (b), construct a histogram for the highway mileages of the same cars. use Class boundaries, 16.5, 20.5, 24.5, 28.5, 32.5, 36.5,, 40.5.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?