At the customer service desk at Home Depot, an average of about 2 customers per hour come in for assistance. A work day is 12 hours. What is the mean...

At the customer service desk at Home Depot, an average of about 2 customers per hour come in for assistance. A work day is 12 hours. What is the mean number of customers on a typical day? Variance? Standard deviation? What is the probability that either 20 or 21 customers will come in on a typical day?