Find the cumulative distribution

Question

Assume the following discrete distribution

x	Pr(x)
0.9
1	0.5
1	0.1

a) If this is a correct distribution, then what is the Pr(x=0.6)?

b) Find the cumulative distribution of x

c) What is the expected value of x?

d) What is the variance of x?

e) If y = sqrtx, then what is the expected value of y?