Exercise $7-6($Algo$)($LO$7-1)$

Customers experiencing technical difficulty with their Internet cable service may call an $800$ number for technical support. It takes the technician between $18$ seconds and $15$ minutes to resolve the problem. The distribution of this support time follows the uniform distribution.

a$.$ What are the values for a and $b$ in minutes? $($Do not round your intermediate calculations. Round your answers to $1$ decimal place.$)$

b$-1.$ What is the mean time to resolve the problem? $($Do not round your intermediate calculations. Round your answer to $2$ decimal places.$)$

Mean