1. An exponential probability distribution

a.is a continuous distribution

b.is a discrete distribution

c.can be either continuous or discrete

d.must be normally distributed

2. Z is a standard normal random variable. What is the value of Z if the area to the right of Z is 0.9803?

a.-2.06

b.0.4803

c.0.0997

d.3.06

3. The ages of students at a university are normally distributed with a mean of 21. What percentage of the student body is at least 21 years old?

a.It could be any value, depending on the magnitude of the standard deviation

b.50%

c.21%

d.1.96%

4. Given that Z is a standard normal random variable. What is the value of Z if the area to the left of Z is 0.9382?

a.1.8

b.1.54

c.2.1

d. 1.77