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. $\begin{array}{ll}x&fx)\
0 & 0.80 \
1 & 0.15 \
2 & 0.04 \
3 & 001
\end{array}$ 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

Question

Quizplus · Accepted Answer

The mean is calculated as $0(0.80) + 1(0.15) + 2(0.04) + 3(0.01) = 0.26$. The standard deviation is calculated using the formula $\sqrt{\sum (x - \mu)^2 \cdot P(x)}$, which results in approximately 0.577.

The Number of Electrical Outages in a City Varies from Day