by installing efficient water fixtures the average america can reduce water use to about 45 gallons of water per day using such water fixtures about how many gallons of water would the average American use in December

What is the range for 31,39,29,34,37,24,36,33,34,28

When you answer this can you 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?