An activity supervisor makes the following estimates about the probability distribution of her activity duration.

Optimistic duration = 10 days

Most likely duration = 16 days

Pessimistic duration = 25 days

1) What estimate of the expected (mean) activity duration should the project manager make?

< 15

>= 15 and < 20

>= 20 and < 25

> 25

2) What estimate of the standard deviation of the activity duration should the project manager make?

< 1

>= 1 and < 2

>= 2 and < 3

>= 3