You are manager of bank and you want to make sure customers do not have an overly long wait for a customer representative (other than the ATM or deposit box which requires no employee interaction)

You are manager of bank and you want to make sure customers do not have an overly long wait for a customer representative (other than the ATM or deposit box which requires no employee interaction). You know historically for each customer there is a X% chance a customer will walk in and will need customer service. You are going to try various scenarios in order to analyze the situation. Each student will be assigned a scenario is slightly different. I will do the first scenario.

90% probability a customer will walk through the door needing customer service. What percent of the time would you expect exactly 10 customers out of ten will require customer service?