A grocery store's receipts show that Sunday customer purchases have a skewed distribution with a mean of $32 and 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) Is it likely that the next 50 Sunday customers will spend an average of at least $40? Explain.