Exam (elaborations) MIDTERM EXAM MATH302 (MATH302)

Part 1 of 9 - 1.0/ 1.0 Points


1.0/ 1.0 Points
Question 1 of 25
Which measure of central location is meaningful when the data are categorical?

A.The mode

B.The median

C.The mean

D.The range



Answer Key: A
Part 2 of 9 - 2.0/ 2.0 Points


1.0/ 1.0 Points
Question 2 of 25
What type of probability uses sample spaces to determine the numerical probability that an event
will occur?

A.subjective probability

B.empirical probability

C.conditional probability

D.classical probability



Answer Key: D

1.0/ 1.0 Points
Question 3 of 25
The formal way to revise probabilities based on new information is to use:

A.common sense probabilities

B.unilateral probabilities

, C.complementary probabilities

D.conditional probabilities



Answer Key: D
Part 3 of 9 - 3.0/ 3.0 Points


1.0/ 1.0 Points
Question 4 of 25
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 fewer than 40 batteries will last at least 8 hours?

A.0.0789

B.0.9598

C.0.7986

D.0.9211



Answer Key: D

1.0/ 1.0 Points
Question 5 of 25
Find the variance of the following probability distribution.

X P(X)
1 0.20
2 0.15
3 0.25
4 0.25
5 0.15