Intervals
Let X Be the Class Mark for Each of the Intervals

Short Answer

Intervals
Let x be the class mark for each of the intervals below. $$\begin{array} { | c | c | } \hline \text { Interval } & \text { Frequency } \\\hline 0 - 2 & 2 \\3 - 5 & 6 \\6 - 8 & 10 \\9 - 11 & 5 \\12 - 14 & 2 \\\hline\end{array}$$
-Find the sample mean for these grouped data.