The probabilistic time is given by (where to = Optimistic time, tp = Pessimistic time and tn = Most likely time)

Answer: Option D

The probabilistic time is given by $$\frac{{\text{t}}_{\text{o}}+{\text{t}}_{\text{p}}+4{\text{t}}_{\text{n}}}{6}$$
Where t_o = Optimistic time, t_p = Pessimistic time and t_n = Most likely time.