Table 71
Factors Foe Calculating Thee- Segma L $\bar { X }$

Table 7.1
Factors foe Calculating Thee- Segma L.tmits for the $\bar { X }$ -chart and $R$ -chart


-Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm. Determine the central line and upper and lower control limits for an $\bar { X }$ and an R- chart, assuming samples of size 8 will be taken. Use Table 7.1. For the R- chart, what is the value of the UCL_R ?

A) less than or equal to 0.1000
B) greater than 0.1000 but less than or equal to 0.1510
C) greater than 0.1510 but less than or equal to 0.2020
D) greater than 0.2020