Find Each Value Requested for the Set of Scores in the Following

Short Answer

Find each value requested for the set of scores in the following frequency distribution table.
a. n $$\begin{array} { c l } \text { Score } & \mathrm { f } \\5 & 1 \\4 & 2 \\3 & 3 \\2 & 5 \\1 & 2\end{array}$$
b. ΣX
c. ΣX²