A grocery​ store's receipts show that sunday customer purchases have a skewed distribution with a mean of ​$3030 and a standard deviation of ​$2121. suppose the store had 304304 customers this sunday. ​a) estimate the probability that the​ store's revenues were at least ​$9 comma 6009,600. ​b) if, on a typical​ sunday, the store serves 304304 ​customers, how much does the store take in on the worst 11​% of such​ days?