Grocery store's receipt show that Sunday customer purchases have a skewed distribution with a mean of $30 and a standard deviation of $20.

1. Why you cannot determine the probability that the next Sunday customer will spend at least $40.
2. Can you estimate the probability that next 10 sunday customers will spend an average of at least $40? Explain.
3. Is it likely that the next 50 Sunday customers will spend an average of at least $40? Explain.