5.1 Expected Value
5 Questions
| Attempts: 290
Questions and Answers
- 1.
What is the expected value of the random variable representing the number observed on a single roll of a six-sided die?
Correct Answer
3.5
21/6 - 2.
A customer randomly selects three RAM modules from a shipment of seven known to contain two defective modules. What is the probability that the customer chooses exactly one defective module? Leave your answer as a fraction in lowest terms.
Correct Answer
4/7 - 3.
A tetrahedron has four equal triangular faces. The faces of a tetrahedral die are labelled with the numbers one, three, five, and seven. What is the expected value of the random variable representing the number observed on a single roll of this die?
- A.
3
- B.
3.5
- C.
4
- D.
5
Correct Answer
C. 4 -
- 4.
When we compare the possible values for a discrete random variable to its expected value, the following statement must be true.
- A.
The possible values and the expected value must all be whole numbers.
- B.
The expected value must be one of the possible values.
- C.
The possible values must all be whole numbers but the expected value may be a rational number.
- D.
The expected value will not be a whole number.
Correct Answer
C. The possible values must all be whole numbers but the expected value may be a rational number. -
- 5.
The following table is a valid probability distribution for a random variable X. What must be the value for P(2) to complete the table? X P(X) 0 0.1 1 0.3 2 3 0.2
Correct Answer
0.4
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Mar 17, 2022Quiz Edited by
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Jan 23, 2014Quiz Created by
Jensenmath9
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