Groceries. A grocery store's receipts show that Sunday customer purchases have a skewed distribution with a mean of $32 a standard deviation of $20.

a) explain why you cannot determine the probability that the next Sunday customer will spend at least $40.

b) can you estimate the probability that the next 10 Sunday customers will spend an average of at least $40? Explain.

c) it is likely that the next 50 Sunday customers will spend an average of at least $40? Explain.