Kroger (the grocery store chain) knows from collected data that customers spend an average of 45 minutes in the store with a standard deviation of 12 minutes. Assume that the length of time spent in the store is normally distributed. Let us assume that Kroger has decided to send coupon packets to those customers who spend the least amount of time in the store. Specifically, they are targeting the bottom 10%. That said, customers who receive these coupons will spend less than how many minutes in the store