Dew in 15 minutes a random sample was taken to determine whether students from a certain classroom prefer to shop at store a, store b, or store c. which of the following would represent a random sample? selecting all the students that have a last name that begins with r selecting all the girls putting all the names in a hat and selecting six students putting all the names in alphabetical order and selecting every fourth student

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?