A renovation of the gift shop at Orlando Amway Center has six activities (in hours). For the following estimates of a,m, and b, calculate the expected time and the standard deviation for each activitiy.
Activities a m b
a 11 15 19
b 27 31 41
c 18 18 18
d 8 13 19
e 17 18 20
f 16 19 22
I have calculated the expected times to be:
A= 15
B= 32
C= 18
D= 13.2
E= 18.2
F= 19