Multiple choice questions based on descriptive

1. Which of the following is NOT a required condition for a discrete probability function?

a. f(x) >= 0 for all values of x
b. sum of f(x) = 1
c. both "a" and "b"
d. none of the above is correct

2. A measure of average value of a random variable is called a(n)

a. Variance
b. Standard deviation
c. Expected value
d. All the above answers are correct
e. None of the above is correct

3. Assume that you have a binomial experiment with p = 0.5 and a sample size of 100. The expected value of this distribution is

a. 0.50
b. 0.30
c. 100
d. 50
e. none of the above is correct