The Rivertown city council is attempting to choose one of four sites (A, B, C, or D) as the location for its new emergency facility. After the new emergency facility becomes available for service, the current emergency facility will be shut down. The project manager has estimated the following response times in minutes from each of the proposed sites to the four areas that must be served by the emergency facility. proposed-site Area-Served
1 2 3 4
A 5.2 4.4 3.6 6.5
B 6.0 7.4 3.4 4.0
C 5.8 5.9 5.9 5.8
D 4.3 4.8 6.5 5.1

The number of emergency runs from the current emergency facility to each of the four areas over the past year is as follows:

Area 1 2 3 4
Number-runs 150 65 175 92

Compute the weighted mean response time from the proposed locations and determine which proposed site should be selected for the new emergency facility.

a. site A
b. site B
c. site C
d. site D