The following is a frequency distribution of grades of a sample of statistics examinations.
$$\begin{array} { c c }
\text { grade } & \text { Frequency } \
50 - 59 & 7 \
60 - 69 & 10 \
70 - 79 & 22 \
80 - 89 & 15 \
90 - 99 & 6
\end{array}$$ Compute the following measures:
a. The mean
b. The variance
c. The standard deviation
d. The coefficient of variation

Question

The following is a frequency distribution of grades of a sample of statistics examinations.
 $$\begin{array} { c c } 
\text { grade } & \text { Frequency } \
50 - 59 & 7 \
60 - 69 & 10 \
70 - 79 & 22 \
80 - 89 & 15 \
90 - 99 & 6
\end{array}$$ Compute the following measures: 
a. The mean
b. The variance
c. The standard deviation
d. The coefficient of variation

Quizplus · Accepted Answer

The Answer of The following is a frequency distribution of grades of a sample of statistics examinations.
 $$\begin{array} { c c } 
\text { grade } & \text { Frequency } \
50 - 59 & 7 \
60 - 69 & 10 \
70 - 79 & 22 \
80 - 89 & 15 \
90 - 99 & 6
\end{array}$$ Compute the following measures: 
a. The mean
b. The variance
c. The standard deviation
d. The coefficient of variation

The Following Is a Frequency Distribution of Grades of a Sample