I appreciate any help on this. This is from Oliver Lehmann's 175 questions -

Together with your team, you applied three-point estimation on a critical path which consists of two activities. The following duration uncertainties are all calculated assuming a ±3sigma confidence interval. The duration uncertainty—defined as pessimistic minus optimistic estimate—of the first activity is 18 days; the second estimate has an uncertainty of 24 days. Applying the PERT formula for paths, what is the duration uncertainty of the entire path? 94

o 21 days

o 30 days

o 42 days

o No statement is possible from the information given.

Thank you,

Savi