# engineering 19

Q1- (Acceptance Sampling Questions) A real estate firm evaluates incoming selling agreement forms using the single sampling plan N = 1500, n = 110, and c = 3. By completing the table, construct the OC curve using about 7 points? (50 points)

 Assumed Process Quality Sample Size Average nonconforming Prob. of Acceptance Percent of Lots accepted P0 100P0 n nP0 Pa 100Pa 0.01 110 0.02 110 0.03 110 0.04 110 0.05 110 0.06 110 0.07 110

Q2- (Probability & Distribution Model Question) The lifetime of a system has a Normal Distribution with µ=6 years and σ=1.2 years. What is the probability the life time exceed 5.028 years (Round up to 3 digits)? (50 points)

Q3- (Attribute Chart Question) Surface defects have been counted on 25 rectangular steel plates, and the data are shown in Table below. Set up a control chart for nonconformities using these data. Does the process producing the plates appear to be in statistical control? (50 points)

 Plates# No. of Defects Answer: Chart: Conclusion: 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 0 4 3 1 2 5 0 2 1 1 0 8 0 2 1 3 5 4 6 3 1 0 2 4