Solve the below:
Q: A major cell phone service provider has determined that the number of minutes that its customers use their phone per month is normally distributed with a mean equal to 445.5 minutes with a standard deviation equal to 177.8 minutes. As a promotion, the company plans to hold a drawing to give away one free vacation to Hawaii for a customer who uses between 400 and 405 minutes during a particular month. Based on the information provided, what proportion of the company's customers would be eligible for the drawing?