The table shows two cell phone plans that offer free minutes for given number of paid minutes used. Pablo has Plan A and Sam has Plan B. a. What is Pablo's ratio of free to paid minutes?

b. What is Sam's ratio of free to paid minutes?

c. Does Pablo's cell phone plan offer the same ratio of free to paid minutes as Sam's? Explain.

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?