Instructor-created question Question Help * An operator is checking items for use in calculating a p-chart using 3 sigma limits. He has taken 20 samples and calculates UCL-,1389 and LCL-,0231. There were 324 defects total and the std deviation is.0193. How many parts did he check per per sample? OA, 200 OB. 100 c. 210 ○ D. 175 OE, 300
Expert Answer
solution
UCL = P+ Z * st. dev
0.1389 = p + 3 *0.0193
p = 0.081
P = total of defects / total of unit sampled (k*n)
n = 200