Calculate the Mean of the Grouped Data from the Given

Multiple Choice

Calculate the mean of the grouped data from the given frequency distribution. (Round your answer to the nearest tenth) $$\begin{array} { | l | l | } \hline \text { Class } & \text { Frequency } ( f ) \\\hline 20 \text { to } 29 & 1 \\\hline 30 \text { to } 39 & 3 \\\hline 40 \text { to } 49 & 3 \\\hline 50 \text { to } 59 & 1 \\\hline 60 \text { to } 69 & 1 \\\hline 70 \text { to } 79 & 1 \\\hline\end{array}$$

A) 27.0
B) 45.5
C) 32.4
D) 49.5