Question

In a process control study, the overall process average over 15 samples is 63.45 with an average corresponding range of 5.6. What is the lower control limit of the R-chart

Answer 1

Answer:

$LCL=1.94$

Step-by-step explanation:

From the question we are told that:

Sample size $n=15$

Mean $\=x=63.45$

Range $R=5.6$

Generally at $n=15$

Value of Control chart constant,

 $LCL=D*R$

Generally the equation for Lower Control Limit is mathematically given by

 $LCL=D*R$

 $LCL= 0.347*5.6$

 $LCL=1.94$