A Small Flower Shop Takes Orders by Phone and Then

Multiple Choice

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. What is the standard deviation for the
Total time to process a phone order and complete the floral arrangement at this flower
Shop (assuming times are independent) ?

A) 8.96 minutes
B) 41 minutes
C) 80.28 minutes2
D) 4.87 minutes
E) 12.43 minutes