Problems 20-23 are based on z scores. Assume all requirements are satisfied and =.05.

1. A local pizza chain called "Quick Slice" claims that they deliver faster than anyone else in town. Overall, the average delivery time across all pizza places in town is 35 minutes with a standard deviation of 10 minutes. Quick Slice's average delivery time is between 20 and 30 minutes. If you randomly call a pizza place and order a pizza, what is the probability that it will arrive within the same as Quick Slice?