Seven students received the following scores on a science exam: 72, 86, 92, 79, 95, 86, 89. What is the range of data? What is the mode of the data? What is the median of the data? What would happen to the median if the student who received a 72 received a 96 instead? Justify your reasoning.

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?