Answer: 9.5 days
Step-by-step explanation:
The following can be deduced from the question:
Optimistic Time (To) = 4 days
Most likely Time (Tm) = 10 days
Pessimistic Time (Tp) = 13 days
Expected Task Duration (Te) will then be calculated as:
= (To + 4Tm + Tp) / 6
= (4 + 4×10 + 13) / 6
= (4 + 40 + 13)/6
= 57 / 6
= 9.5 days