Agrocery store's receipts show that sunday customer purchases have a skewed distribution with a mean of $33 and a standard deviation of $20. suppose the store had 316 customers this sunday. a) estimate the probability that the store's revenues were at least $10 comma 500. b) if, on a typical sunday, the store serves 316 customers, how much does the store take in on the worst 10% of such days? mymathlab ap stats