Question: Solve the following problem please. Show all the steps leading to the final answers. A portion of a construction activity network is shown below; an

Solve the following problem please. Show all the steps leading to the final answers.

(a)Determine the probability that C fails to start on schedule.

(b)Determine the probability the D starts on schedule.

(c)Find the average and variance of the total time to complete the four activities.

Solve the following problem please. Show all the steps leading to the

A portion of a construction activity network is shown below; an arrow indicates the starting and ending of an activity. Each activity can only begin when the previous one has been completed. The durations of activities A and B are statistically independent of all other activities. The durations of activities C and D are positively correlated with a value of +0.4. The scheduled starting dates are shown below. Each activity's completion time is normally distributed. Assume that A starts on schedule. Activity Scheduled Start Mean Time to Standard Day Completion Deviation da s _-0-_ (a) Determine the probability that C fails to start on schedule. (b) Determine the probability the D starts on schedule. (0) Find the average and variance of the total time to complete the four activities

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