Measures of the Spread of the Data · Exercise 20

Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows:

\begin{array}{|c|c|}\hline \text{# of movies} & \text{Frequency} \\ \hline \text{0} & \text{5} \\ \hline \text{1} & \text{9} \\ \hline \text{2} & \text{6} \\ \hline \text{3} & \text{4} \\ \hline \text{4} & \text{1} \\ \hline\end{array}

(a) Find the sample mean $\bar{x}$.
(b) Find the approximate sample standard deviation, s.

OpenStax, Introductory Statistics 2e · §2.7 Measures of the Spread of the Data · Exercise 20