MATH 302 MIDTERM EXAM 2 – QUESTION AND ANSWERS GRADE A

MATH 302 MIDTERM EXAM 2 – QUESTION AND
ANSWERS
Part 1 of 9 - 1.0/ 1.0 Points



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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



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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



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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.0.078
9
B.0.959
8
C.0.798
6
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