To function properly, a rainwater outflow pups must drop exactly 1 in for every 25 inches of horizontal distance. a 40 feet long rainwater pipe runs under the edge of a roof. what is the verticals distance, in inches, the pipe must drop between its ends? round to the nearest tenth

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?