1.Consider the probability distributionbelow

x probability p(x)

0 0.8

51 0.2

what is the population mean?

2.What is the mean of a random variable with probability distribution?

x 0 44

p(x) 0.9 0.1

3.What is the standard deviation of the return of an investment

if the investment has the probability distribution?

x 19 99

p(x) 0.9 0.1

Hint thepopulatiom mean is 27

4.Consider the probability distribution below

x probability p(x)

4.7 0.8

6.2 0.2

what is the standard deviation?

Hint: the population mean is 5