FS1

Question 1

expected value of a discreet random variable > E(X)

Answer 1

sigma x * p(X=x)

Question 2

variance of a discreet random variable

Answer 2

var(X) = E(x squared) - (E(x))squared

Question 3

E(g(X))

Answer 3

sigma g(x) * p(X=x)

Question 4

E(aX+b)

Answer 4

aE(X)+b

Question 5

E(X+Y)

Answer 5

E(X)+E(Y)

Question 6

Var(aX+b)

Answer 6

a squared Var(X)