IT staff for a large corporation has developed the following probability
Distribution for the number of calls requiring troubleshooting problems per day. Based
On the distribution, the standard deviation in the number of calls per day is $\begin{array}{cc}
\text { Number of Calls } & \text { Probability } \
0 & .32 \
1 & .35 \
2 & .18 \
3 & .10 \
4 & .05
\end{array}$

A) 1.31
B) 1.14
C) 2.77
D) 1.56
E) 1.21

Question

IT staff for a large corporation has developed the following probability
Distribution for the number of calls requiring troubleshooting problems per day. Based
On the distribution, the standard deviation in the number of calls per day is $\begin{array}{cc}
\text { Number of Calls } & \text { Probability } \
0 & .32 \
1 & .35 \
2 & .18 \
3 & .10 \
4 & .05
\end{array}$

A) 1.31
B) 1.14
C) 2.77
D) 1.56
E) 1.21

Quizplus · Accepted Answer

To find the standard deviation, first calculate the expected value (mean) of the distribution, then use it to find the variance, and finally take the square root of the variance. The calculations lead to a standard deviation of approximately 1.14.

IT Staff for a Large Corporation Has Developed the Following Number of Calls Probability 0.321.352.183.104.05\begin{array}{cc}\text { Number of Calls } & \text { Probability } \\0 & .32 \\1 & .35 \\2 & .18 \\3 & .10 \\4 & .05\end{array} Number of Calls 01234​ Probability .32.35.18.10.05​

IT Staff for a Large Corporation Has Developed the Following $\begin{array}{cc}\text { Number of Calls } & \text { Probability } \\0 & .32 \\1 & .35 \\2 & .18 \\3 & .10 \\4 & .05\end{array}$