(Situation D) a Walk-In Freezer Thermostat at a Restaurant Is $\text { Day }$

(Situation D) A walk-in freezer thermostat at a restaurant is set at 5°F. Because of the perishability of the food in the freezer, the restaurant manager has decided to begin monitoring the temperature inside the freezer. The managers used a precision thermometer to take sample temperature readings at five randomly chosen times per day for 10 days. The data are presented below.

$\text { Day }$ $\quad$ $\quad$ $\text { Temperature }\left(^{\circ}\right. \text { F) }$
$\begin{array}{rrrrrr}\hline 1 & 5.22 & 5.29 & 5.11 & 4.95 & 4.78 \\2 & 4.40 & 4.41 & 4.63 & 6.03 & 4.83 \\3 & 5.11 & 5.43 & 4.90 & 4.55 & 5.23 \\4 & 5.65 & 4.24 & 5.09 & 4.82 & 5.50 \\5 & 4.68 & 5.92 & 4.71 & 4.67 & 4.75 \\6 & 5.01 & 5.26 & 6.10 & 5.20 & 5.25 \\7 & 5.20 & 4.99 & 5.15 & 5.96 & 5.35 \\8 & 4.30 & 4.91 & 5.03 & 4.97 & 4.80 \\9 & 5.45 & 5.62 & 6.11 & 5.13 & 4.90 \\10 & 5.06 & 5.13 & 4.95 & 5.59 & 5.80 \\\hline\end{array}$

-Calculate the centerline of the R-chart.