The 3 – sigma upper limit for a control chart for average number of nonconformities per unit, is expressed by __________
Posted: Thu Jul 14, 2022 1:53 pm
a) UCL=\(\bar{u} + 3\sqrt{\frac{\bar{u}}{n}}\)
b) UCL=\(\bar{u} – 3\sqrt{\frac{\bar{u}}{n}}\)
c) UCL=\(\bar{u} – 2\sqrt{\frac{\bar{u}}{n}}\)
d) UCL=\(\bar{u} – \frac{3}{2} \sqrt{\frac{\bar{u}}{n}}\)
b) UCL=\(\bar{u} – 3\sqrt{\frac{\bar{u}}{n}}\)
c) UCL=\(\bar{u} – 2\sqrt{\frac{\bar{u}}{n}}\)
d) UCL=\(\bar{u} – \frac{3}{2} \sqrt{\frac{\bar{u}}{n}}\)