Random Samples of Four Items Are Selected from a Manufacturing

Multiple Choice

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples,ΣX = 15,350 and ΣR = 411.4. To construct a range chart,what is the UCL for the range?

A) 37.553
B) 411.400
C) 0.000
D) 102.850