Probability Distribution of a Discrete Random Variable

Given the probability distribution, what is P(X < 1)?

If two coins are tossed, which is NOT a possible value of the random variable for the number of heads?

• 0

• 1

• 2

• 3

Which of the following is NOT true for any discrete random variable X?

• It can be described by a formula.

• It is the listing of the possible samples and the corresponding mean.

• Yes

• No

• Maybe

• Cannot be determined

What formula describes the probability distribution?

Decide whether the distribution is a probability distribution.

• Yes, it is a discrete probability distribution.

• No, it is not a discrete probability distribution.

Which of the following is true about every random variable

• It takes on numerical or categorical values.

• It describes the results of a random phenomenon.

• It’s behavior can be described by a probability distribution.

• (b) and (c) are true, but not (a).

In government data, a family consists of two or more persons who live together and are related by blood or marriage. Choose an American family at random and count the number of people it contains. What is the probability that the family you choose has
more than 2 people?

• 0.35

• 0.42

• 0.58

• 1.00

The number of books in your locker.

• Continuous

• Discrete

The number of babies born at Greenville Memorial Hospital this month.

• Continuous

• Discrete