For the Following Data, Approximate the Mean Number of Unused

Multiple Choice

For the following data, approximate the mean number of unused vacation days at the end of the year. $$\begin{array} { c | c } \text { Days } & \text { Frequency } \\\hline 1 - 2 & 2 \\3 - 4 & 21 \\5 - 6 & 20 \\7 - 8 & 10 \\9 - 10 & 30\end{array}$$

A) 6.6
B) 6.1
C) 7.1
D) 7.8