Calculation of mean and variance of a discrete random variable

1. Suppose that a variable x has the following distribution function:
x p(x)
3 0.23
5 0.41
9 0.36
What is the population mean?

2. Suppose that a variable x has the following distribution function:
x p(x)
1 0.18
6 0.16
9 0.15
24 0.51
What is F(9)?

3. Suppose that a variable x has the following distribution function:
x p(x)
1 0.19
5 0.15
8 0.66
What is the population variance?

4. Suppose that a variable x has the following distribution function: x p(x) 3 0.23 5 0.41 9 0.36 What is the expected value of (X - mean of x)^2?

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