6. You have decided to paint a room that is approximately 10' x 20' in size. You have decided that all the walls and ceiling will be the same color and painted with a standard flat paint that is guaranteed to cover the existing paint with a single coat. The woodwork around the four windows and two doors will be painted with a semigloss paint.
All paint and other supplies will be available at the start of the job. You have asked friends and relatives who have done similar painting jobs for the time that they needed to complete their painting jobs. Information on thirty-two similar painting jobs is given in the following table.
Hours Minutes Hours Minutes Based on this information and your experience with similar jobs, estimate the mean and variance of this task. How do your estimates vary if you use the (a)

standard PERT formulas,

(b) the three-fractile approach,

(c) the five-fiactile approach, and

(d) the seven-hctile approach? How many hours would you estimate if you were to submit a fixed cost bid for this painting job?