5 Questions
| Total Attempts: 105

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?
- 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.** - 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

- 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.

- 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