Customers experiencing technical difficulty with their Internet cable service may call an 800 number for technical support. It takes the technician between 30 seconds and 10 minutes to resolve the problem. The distribution of this support time follows the uniform distribution.

What are the values for a and b in minutes?

What is the mean time to resolve the problem? What is the standard deviation of the time?

What percent of the problems take more than 5 minutes to resolve?