A Small Flower Shop Takes Orders by Phone and Then

A small flower shop takes orders by phone and then one of the staff florists is assigned
to prepare the arrangement. The time it takes to process phone orders is normally
distributed with a mean of 6 minutes and a standard deviation of 2.5 minutes. The time it
takes for an arrangement to be completed is normally distributed with a mean of 35
minutes and a standard deviation of 8.6 minutes.
A. What are the mean and standard deviation for the total time to process a phone order
and complete the floral arrangement at this flower shop?
b. What is the probability that it will take more than 50 minutes to process a phone order
and complete the floral arrangement at this flower shop?