SCENARIO 19-4 She Also Decides That Lower and Upper

Multiple Choice

SCENARIO 19-4 She also decides that lower and upper specification limit for the critical-to-quality variable should be
10 and 30 seconds, respectively.
-Referring to Scenario 19-4, suppose the supervisor constructs an R chart to see if the variability in
Collection times is in-control.What is the center line of this R chart?

A) 20.00
B) 20.56
C) 20.40
D) 24.00