Derive the probability distribution of the completion times

Reference no: EM1382438

Question:

a. The following probability distributions relate to the completion times, in weeks, T_A and T_B of two independent activities, A and B respectively.

t	Pr(T_A =t)
2	0.20
4	0.35
6	0.25
8	0.20

t	Pr(T_B =t)
3	0.25
5	0.50
7	0.25

The activities A and B form a important phase of a project.

i). Derive the probability distribution of the completion times of this phase if the two activities are undertaken in:

a. series

b. parallel

ii) For each of the distribution in (i) above, calculate their relevant statistics.

A task is known to have the following time to completion (in days), T and cost, C probability distribution, respectively: T ≈ N(20,25)

The distribution of C is conditional on T and is given by:

N(1500,4900), T ≤ 22;

C ≈ N(1800,4900), 22<T ≤ 25;

N(2300,4900), 25< T.

Calculate:

i). Pr(T≤ 25);

ii Pr(C≤ 2200).

Reference no: EM1382438

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