A company did a study of available vacation time for their staff employees over the past years. They determined the probability a staff employee selected at random has 2 weeks’ vacation was 45%, 1...

A company did a study of available vacation time for their staff employees over the past years.  They determined the probability a staff employee selected at random has 2 weeks’ vacation was 45%, 1 week vacation 10%, 3 weeks’ vacation 20%, and more than 3 weeks’ vacation was 25%.  The company randomly selects 20 employees.  What is the probability that out of the 20 selected, at least 2 workers have 1 week vacation time?