If necessary consult a list of formulas Ex VarX Value of 0 0

(If necessary, consult a list of formulas.)

E(x)=

Var(X)=

Value of
0	0.05
10	0.05
20	0.75
30	0.05
40	0.05
50	0.05

Solution

Consider this table:

x   P(x)   xP(x)   x^2 P(x)
0   0.05   0   0
10   0.05   0.5   5
20   0.75   15   300
30   0.05   1.5   45
40   0.05   2   80
50   0.05   2.5   125
Total       21.5   555

Thus,

E(x) = 21.5 [ANSWER]

var(x) = E(x^2) - E(x)^2 = 555 - 21.5^2 = 92.75 [answer]