Find a Doctor, is a small startup that helps people find a physician that best meets their needs (location, insurance accepted, etc.) During a “slow” time for them, they have 9 staff members taking calls from customers. On average, one call arrives every 5 minutes. On average, each staff member spends 21 minutes with each customer..
(Round your answer to 1 decimal place.)
What is the probability that one of their staff members is busy?