大家帮忙看道CQE关于控制图的题
An X-bar and R chart with n=5 has been plotted for some time and has demonstrated random variation. Upon review of the last 30 plot points, the expected number of runs around the centerline on the X-bar chart is xpected to be approximately which of the following?
A. 4
B. 9
C.12
D.16
看不懂呀~~~
A. 4
B. 9
C.12
D.16
看不懂呀~~~
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