The Number of Electrical Outages in a City Varies from Day

question 68

Multiple Choice

The number of electrical outages in a city varies from day to day.Assume that the number of electrical outages (x) in the city has the following probability distribution.
$$\begin{array} { c c } x & f ( x ) \\\hline 0 & 0.80 \\1 & 0.15 \\2 & 0.04 \\3 & 0.01\end{array}$$
The mean and the standard deviation for the number of electrical outages (respectively) are

• A) 2.6 and 5.77
• B) 0.26 and 0.577
• C) 3 and 0.01
• D) 0 and 0.8

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