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- September 13, 2020
- By menge

Let be a random variable with the following probability distribution:

Value x of x PX=X

0 .05

10 .35

20 .15

30 .40

40 .05 Find the expectation X and variance X of X .

x p

0

10

20

30

40 E(X)

var(X) x^2

0.05

0.35

0.15

0.4

0.05

20.5

114.75 x*p

0

100

400

900

1600 x^2*p

0

3.5

3

12

2

20.5 0

35

60

360

80

535