Please sir answers

HOW TO FORMULATE ANSWERS IN EXCEL:

The intern recently visited a busy convenience store near the corporate headquarters. She observed customers visiting a Mungo Foods snack display. On average, 14 customers approached the display each hour she observed. If she assumes that customer arrivals follow a Poisson distribution (with a mean of 14 customers per hour), answer the following questions

1) What is the probability that no customers visit the snack display in a one-hour period?

2) What is the probability that more than 20 customers visit the display in a one-hour period?