Discrete Probability Distribution

In a certain community, 30% of households have 1 child, 43% have 2 children, and 27% have 3 children. If a household is selected at random, what is the expected number of children in that household? HINT: A Probability table may be helpful.

• 2.00

• 2.13

• 1.97

• 1.27

The table above shows the number of cell phones per household in a small town. Find the mean round to the nearest hundredth.

• 2.80

• 2.93

• 0.10

• 0.14

Using the probability distribution, find P(X > 1).

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.

What formula describes the probability distribution?

What is the numerical quantity assigned to the outcome of an experiment usually denoted by an uppercase letter such as X?

• Frequency

• Probability

• Random variable

• Sample

• Yes

• No

• Maybe

• Cannot be determined

Is this a probability distribution?

• No

• Yes