Question

whats the standard deviation for A,B,C,D,E,F

13 of 19 (14 complete) Problem 3.18 A renovation of the gift shop at Orlando Amway Center has six activities (in hours). In the following table, the estimates of a, m, and times for each of the activities are listed 32 Based on the activity time estimates, the expected times for each of the activities are (round your responses to two decimo places): Activity Expected Time 15.50 32 B3 17.00 13.33 19.00 19.66 Based on the activity time estimates, standard deviation for each of the activities is enter your responses rounded to iwo decimal places); Activity Standard Deviation Enter your answer in the answer box and then click Check Answer.

Answer 1

Expected Duration of each activity = ( a + 4*m + b ) / 6

Variance of Each activity = σ² = { (b - a) / 6 }²

Standard Deviation of each activity = √σ² = (b - a) / 6

Calculating using above formula -

Activity	a	m	b	Expected Time	Variance	Standard Deviation
A	11	16	18	15.50	1.36	1.17
B	28	32	41	32.83	4.69	2.17
C	17	17	17	17.00	0.00	0.00
D	8	13	20	13.33	4.00	2.00
E	18	19	20	19.00	0.11	0.33
F	17	20	21	19.67	0.44	0.67