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 to the supermarket. market analysts have determined that once the promotion goes into effect the expenditures by all customers will be normally distributed with a mean of $95 and a standard deviation of $21. if the management decides to give free gifts to all those customers who spend more than $130 at this supermarket during a visit, what percentage of the customers are expected to get free gifts?