(Situation F) Ten samples of $n = 5$ were collected to construct an $\bar { R }$-chart. The sample means and ranges for the 10 samples are shown below.

$\begin{array}{cccccc}
\hline \text { Sample } & \text { Mean } & \text { Range } & \text { Sample } & \text { Mean } & \text { Range } \
\hline 1 & 20.2 & 2.7 & 6 & 20.4 & 1.9 \
2 & 22.4 & 1.8 & 7 & 15.9 & 1.0 \
3 & 21.2 & 1.5 & 8 & 22.3 & 2.1 \
4 & 18.2 & 1.2 & 9 & 20.7 & 1.6 \
5 & 23.2 & 2.4 & 10 & 21.1 & 1.8
\end{array}$
-Calculate the centerline of the $\text { R-chart. }$
A) 1.0386
B) 2.057
C) 1.80
D) 4.114

Question

(Situation F) Ten samples of $n = 5$ were collected to construct an $\bar { R }$-chart. The sample means and ranges for the 10 samples are shown below.

$\begin{array}{cccccc}
\hline \text { Sample } & \text { Mean } & \text { Range } & \text { Sample } & \text { Mean } & \text { Range } \
\hline 1 & 20.2 & 2.7 & 6 & 20.4 & 1.9 \
2 & 22.4 & 1.8 & 7 & 15.9 & 1.0 \
3 & 21.2 & 1.5 & 8 & 22.3 & 2.1 \
4 & 18.2 & 1.2 & 9 & 20.7 & 1.6 \
5 & 23.2 & 2.4 & 10 & 21.1 & 1.8
\end{array}$
-Calculate the centerline of the $\text { R-chart. }$
A) 1.0386
B) 2.057
C) 1.80
D) 4.114

Quizplus · Accepted Answer

The centerline of the R-chart is the average of the sample ranges. Calculate the average of the given ranges: (2.7 + 1.8 + 1.5 + 1.2 + 2.4 + 1.9 + 1.0 + 2.1 + 1.6 + 1.8) / 10 = 1.80.

(Situation F) Ten Samples Of n=5n = 5n=5 Were Collected to Construct An

(Situation F) Ten Samples Of $n = 5$ Were Collected to Construct An