3. Juan can ride his bike 19.3 miles in 5/3 of an hour. What is his unit rate riding speed? 4. Rakelle bought 12/7 pounds of oranges for $2.43. What is the unit rate for her buying oranges? (Write answer as a dollar amount.)
5. Tyler can eat 2/3 of a bag of chips in 6/5 minutes. What is his unit rate for eating chips?

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?