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Q2. 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 decides to give free gifts to all those customers who spend more than $130 at this supermarket during a visit, (a) What is the probability that a randomly selected customer will spend between $128 and $135? W (b) Graphically show the area under the normal distribution curve corresponding the probability your computed in (a) and state two properties of such a distribution. 3 (c) what percentage of the customers are expected to get free gifts