? 
P(?) 
?P (?) 
?^{2}P(?) 
0 
0.15 

1 
0.20 

2 
0.35 

3 
0.22 

4 
0.08 

? 
P(?) 
?P(?) 
0 
0.4 

1 
0.1 

2 
0.3 

5 
0.12 

10 
0.05 
(1)
x  P(x)  x * P(x)  x^{2} * P(x) 
0  0.15  0  0 
1  0.2  0.2  0.2 
2  0.35  0.7  1.4 
3  0.22  0.66  1.98 
4  0.08  0.32  1.28 
Sum  1  1.88  4.86 
Mean = = X * P(X) = 1.88
Variance = X ^{2} * P(X)  ^{2} = 4.86  1.88^{2} = 1.3256
Standard deviation = = 1.151347
(2)
x  P(x)  x * P(x) 
0  0.4  0 
1  0.1  0.1 
2  0.3  0.6 
5  0.12  0.6 
10  0.05  0.5 
Sum  0.97  1.8 
expected value = = X * P(X) = 0.97
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