# apu math302 midterm exam done on april 2015

September 29, 2018

Question 1 of 25
1.0/ 1.0 Points
If you classified the fruit in a basket as apple, orange, or
banana, this would be an example of which level of measurement?
A.interval
B.ordinal
C.ratio
D.nominal

Part 2 of 9 – 2.0/
2.0 Points

Question 2 of 25
1.0/ 1.0 Points
If two events are mutually exclusive, what is the
probability that one or the other occurs?
A.0.25
B.Cannot be determined from the information
given.
C.0.50
D.1.00

Question 3 of 25
1.0/ 1.0 Points
The staff at a small company includes: 4 secretaries, 20
technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is
selected at random, what is the probability that he or she is a factory worker?
A.5/8
B.2/5
C.1/8
D.1/4

Part 3 of 9 – 2.0/
3.0 Points

Question 4 of 25
1.0/ 1.0 Points
A die is rolled 360 times. Find the standard deviation for
the number of 3s that will be rolled.
A.60
B.50
C.7.1
D.5.9

Question 5 of 25
1.0/ 1.0 Points
A researcher surveyed college students to study their
opinion about the proposed change in smoking rules. The researcher asked a
group of 30 students: 12 of them supported the change, 13 of them did not, and
5 had no opinion. This is not a binomial model because…
A….the students who
strongly supported the change and those who only mildly supported the change
are counted the same.
B….less than half
of the students supported the change.
C.30 students are not
enough for a good sample
D….there are 3 possible outcomes, not 2.

Question 6 of 25
0.0/ 1.0 Points
Suppose that 50 identical batteries are being tested. After
8 hours of continuous use, assume that a given battery is still operating with
a probability of 0.70 and has failed with a probability of 0.30.

What is the probability that greater than 30 batteries will
last at least 8 hours?
In A.0.0848
B.0.9152
C.0.8594
D.0.9522

Part 4 of 9 – 5.0/
6.0 Points

Question 7 of 25
1.0/ 1.0 Points
One reason for standardizing random variables is to measure
variables with:
A.different means and
standard deviations on a non-standard scale
B.similar means and
standard deviations on two scales
C.dissimilar means
and similar standard deviations in like terms
D.different means and standard deviations on a
single scale

Question 8 of 25
1.0/ 1.0 Points
If Z is a standard normal random variable, then the value z