1. In an introductory psychology class with n=50 students, there are 9 freshman males, 15
freshman females, 8 sophomore males, 12 sophomore females and 6 junior females. A
random sample of n=2 students is selected from the class. If the first student in the
sample is a male, what is the probability that the second student will also be a male?
a. 8/14
b. 12/20
c. 20/44
d. 20/50
2. A vertical line is drawn through a normal distribution at z=0.50, and separates the
distribution into two sections. What proportion of the distribution is in the larger
section?
a. 0.6915
b. 0.3085
c. 0.1915
d. 0.3830
3. A normal distribution has µ=80 and ð=10. What is the probability of randomly selecting a
score greater than 75 from the distribution?
a. p=0.50
b. p=0.25
c. p=0.3085
d. p=0.6915
4. A normal distribution has a mean of µ=70 with ð=12. If one score is randomly selected
from this distribution, what is the probability that the score will be greater than x+79?
a. 0.7734
b. 0.2266
c. 0.2734
d. 0.3085
5. A normal distribution had a mean of µ=70 with ð=12. If one score is randomly selected
from this distribution, what is the probability that the score will be less than X=76?
a. 0.1915
b. 0.3085
c. 0.6915
d. 0.3830
6. A normal distribution has a µ=100 with ð=20. If one score is randomly selected from this
distribution, what is the probability that the score will have a value between X=80 and
X=100?
a. 0.8413
b. 0.1587
c. 0.3413
d. 0.6826
7. A normal distribution has a mean of µ=100 with ð=20. If one score is randomly selected
from this distribution, what is the probability that the score will have a value between
X=90 and X=120?
a. 0.1498
b. 0.4672
c. 0.5328
d. 0.2996
