A Friend Has Constructed the Following Frequency Distribution of Test

Essay

A friend has constructed the following frequency distribution of test scores in his business statistics class:
$$\begin{array} { | l | l } \hline \text { Score } & \text { Number af Students } \\\hline 40 \text { and below } & 2 \\\hline 40 - 50 & 6 \\\hline 50 - 60 & 8 \\\hline 60 - 70 & 13 \\\hline 70 - 80 & 11 \\\hline 80 - 90 & 5 \\\hline 90 \text { and above } & 4 \\\hline\end{array}$$ He asks for your feedback.What advice would you give him?