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Find the mean and variance for the following discrete distributions.

Find the mean and variance for the following discrete distributions.

A) f(x) = 1/5, x=5,10,15,20,25

B) f(x) = 1, x=5

C) F(x) = 4-x/6 x=1,2,3

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CH230410_481023_STAT(solution).xls

f(x) x
0.2
0.2
0.2
0.2
0.2 x^2
5
10
15
20
25 f(x)*x
25
100
225
400
625 f(x)*x^2
1
2
3
4
5 mean E-D^2 5
20
45
80
125 A
4
16
36
64
100 15 220 variance
B f(x) x
1 x^2
5 f(x)*x
25 f(x)*x^2
5 E-D^2
25 0...

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