Use the Range Rule of Thumb to Approximate the Standard $\begin{array} { l l l l l l l l } 114.6 & 115.8 & 116.7 & 113.5 & 113.4 & 114.6 & 112.9 & 115.2 \end{array}$

Use the range rule of thumb to approximate the standard deviation.
-The following is a set of data showing the water temperature in a heated tub at different time intervals. Round results to the nearest tenth. $\begin{array} { l l l l l l l l } 114.6 & 115.8 & 116.7 & 113.5 & 113.4 & 114.6 & 112.9 & 115.2 \end{array}$

A) $- 55.9$
B) $1.3$
C) $1.0$
D) $0.8$