The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. $$\begin{array} { l l }
\text { Time } & \text { Frequency } \
20 - 39 & 2 \
40 - 59 & 4 \
60 - 79 & 6 \
80 - 99 & 4 \
100 - 119 & 2
\end{array}$$
a.
Compute the mean.
b.
Compute the variance.
c.
Compute the standard deviation.
d.
Compute the coefficient of variation.

Question

The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. $$\begin{array} { l l } 
\text { Time } & \text { Frequency } \
20 - 39 & 2 \
40 - 59 & 4 \
60 - 79 & 6 \
80 - 99 & 4 \
100 - 119 & 2
\end{array}$$ ​ 
a.
Compute the mean.
b.
Compute the variance.
c.
Compute the standard deviation.
d.
Compute the coefficient of variation.

Quizplus · Accepted Answer

The Answer of The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. $$\begin{array} { l l } 
\text { Time } & \text { Frequency } \
20 - 39 & 2 \
40 - 59 & 4 \
60 - 79 & 6 \
80 - 99 & 4 \
100 - 119 & 2
\end{array}$$ ​ 
a.
Compute the mean.
b.
Compute the variance.
c.
Compute the standard deviation.
d.
Compute the coefficient of variation.