The Drying Rate in an Industrial Process Is Dependent on Many

Short Answer

The drying rate in an industrial process is dependent on many factors and varies according to the following distribution. $$\begin{array}{l}\begin{array} { c c } &\text { Relative }\\\text { Minutes } & \text { Frequency } \\\hline 3 & 0.22 \\4 & 0.36 \\5 & 0.28 \\6 & 0.10 \\7 & 0.04\end{array}\end{array}$$
Compute the mean drying time.