(1)
(2)
(3)=
(2)/N
(4)=
(3) x (1)
(5) =
(1) x (4)
=
=
(8) =(5) - (6)=
Standard Deviation = 
=
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Worksheet for Expected Values and Variance |
Worksheet for Computing the Probability
Distribution, mean and variance of a Discrete Random Variable, x.
Example
| Number
of Arrival, x
(1) |
Numbers
of 10 minutes Interval, f
(2) |
Relative
Frequency or Probability of x, Pr(x)=f/N
(3)= (2)/N |
x Pr(x)
(4)= (3) x (1) |
x2
Pr(x)
(5) = (1) x (4) |
| N= | 1 | = |
(7)= |
|
| (6) |
Variance =
(8) =(5) - (6)= Standard Deviation = |
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