324 / 762
324
Chapter 8: Discrete Probability Distributions
the second prize will be 1/999; the third prize will be 1/998; and not winning
will be 997/1000.
Based on these computations, the probability distribution for
X
is given in
Table 8-9
.
Table 8-9:
Probability Distribution
for
Example 8-6
Once again, one can use the tabular presentation to help find the variance for
a discrete random variable. We can work out the values for the different
terms in the computational variance formula. This is illustrated in
Table 8-10
.