3. A bag of gumballs contains 10 green gumballs, 8 orange gumballs, 12 pink gumballs, and 15 red gumb
You randomly select gumballs then replace them.
a) What is the probability that a gumball you pick on the first pick will be pink

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?