Need answer for a and b

nts: 0 Of 1 A grocery store's recelpts show that Sunday customer purchases have a skewed distribution with a mean of $25 and a standard deviation of $17. Suppose the store had 325 customers this Sunday. a) Estimate the probability that the store's revenues were at least $8,400. b) If. on a typical Sunday. the store serves 325 customers. how much does the store take in on the worst 10% of such days? a) The probability is [1. (Round to four decimal places as needed.)