Find the Standard Deviation of the Data Summarized in the Given

question 21

Multiple Choice

Find the standard deviation of the data summarized in the given frequency distribution.
-The test scores of 40 students are summarized in the frequency distribution below. Find the standard deviation. $$\begin{array} { c | c } \text { Score } & \text { Students } \\\hline 50 - 59 & 6 \\60 - 69 & 6 \\70 - 79 & 5 \\80 - 89 & 6 \\90 - 99 & 17\end{array}$$

• A) 13.9
• B) 16.2
• C) 14.6
• D) 15.4