plz help me with this question, DON'T explain to me I want the direct answer , solve it

Many retail stores offer their own credit cards. At the time of the credit application, the customer is given a 10% discount on the purchase. The time required for the credit application process follows a uniform distribution with the times ranging from 4 minutes to 10 minutes.

(a) What is the mean time for the application process?

(b) What is the standard deviation of the process time?

(c) What is the likelihood a particular application will take less than 6 minutes?

(d) What is the likelihood an application will take more than 5 minutes?