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.
?
?
x
f(x)
?
0
0.80
?
1
0.15
?
2
0.04
?
3
0.01
?
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.
Answer: B
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