A machine that is supposed to fill small bottles to contain 20 ml yields the following data from a test of 4 bottles every hour.
$\begin{array}{l|llll|l|l}
S&&&A&&M&R\\hline
1 & 19.9 & 20.1 & 20.2 & 20 . 3& 20.125 & 0.4 \
2 & 20.4 & 20.0 & 20.3 & 20.3 & 20.25 & 0.4 \
3 & 20.0 & 20.7 & 20.4 & 20.3 & 20.35 & 0.7 \
4 & 20.4 & 20.1 & 20.1 & 19.9&20 .125&0 .5\
5 & 19.9 & 19.8 & 19.6 & 19.5 & 19.7 & 0.4 \
6 & 19.4 & 19.4 & 19.6 & 19.7&19 .525&0 .3 \
7 & 19.8 & 19.4 & 19.6 & 19.7&19 .625&0 .4 \
8 & 19.9 & 19.8 & 20.0 & 20.0 & 19.925&0 .2 \
9 & 20.2 & 20.3 & 20.1 & 20.3&20 .225&0 .2\
10 & 20.0 & 20.3 & 20.0 & 20.2 & 20.125&0 .3 \
11 & 20.3 & 20.5 & 20.1 & 20.2&20.275&0 .4 \
12 & 20.1 & 19.9 & 19.8 & 19.7&19 .875&0 .4\
13 & 19.5 & 19.8 & 19.7 & 19.6 & 19.65 & 0.3 \
14 & 19.4 & 19.8 & 19.8 & 19.4 & 19.4 & 0.4 \
15 & 19.5 & 19.6 & 19.6 & 19.9 & 19.65 & 0.4\
\end{array}$

Question

A machine that is supposed to fill small bottles to contain 20 ml yields the following data from a test of 4 bottles every hour. 
$\begin{array}{l|llll|l|l}
S&&&A&&M&R\\hline
1 & 19.9 & 20.1 & 20.2 & 20 . 3& 20.125 & 0.4 \
2 & 20.4 & 20.0 & 20.3 & 20.3 & 20.25 & 0.4 \
3 & 20.0 & 20.7 & 20.4 & 20.3 & 20.35 & 0.7 \
4 & 20.4 & 20.1 & 20.1 & 19.9&20 .125&0 .5\
5 & 19.9 & 19.8 & 19.6 & 19.5 & 19.7 & 0.4 \
6 & 19.4 & 19.4 & 19.6 & 19.7&19 .525&0 .3 \
7 & 19.8 & 19.4 & 19.6 & 19.7&19 .625&0 .4 \
8 & 19.9 & 19.8 & 20.0 & 20.0 & 19.925&0 .2 \
9 & 20.2 & 20.3 & 20.1 & 20.3&20 .225&0 .2\
10 & 20.0 & 20.3 & 20.0 & 20.2 & 20.125&0 .3 \
11 & 20.3 & 20.5 & 20.1 & 20.2&20.275&0 .4 \
12 & 20.1 & 19.9 & 19.8 & 19.7&19 .875&0 .4\
13 & 19.5 & 19.8 & 19.7 & 19.6 & 19.65 & 0.3 \
14 & 19.4 & 19.8 & 19.8 & 19.4 & 19.4 & 0.4 \
15 & 19.5 & 19.6 & 19.6 & 19.9 & 19.65 & 0.4\
\end{array}$

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A Machine That Is Supposed to Fill Small Bottles to Contain