Chapter 6 Review AP Stats

Choose the correct examples of discrete variable.

• A film critic's rating of a film (0 - 4 stars)

• Time taken to commute to work

• The sum of the numbers rolled on a pair of dice

• Winning ticket number drawn from a raffle

• Amount of gasoline a car

Discrete or Continuous?

Let x represent the number of books in a university library.

• Discrete

• Continuous

Discrete or Continuous?

Let x represent the volume of blood drawn for a blood test.

• Discrete

• Continuous

Is the following a probability distribution?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, all probabilities are not be between 0 and 1 inclusive

• No, the sum of all the probabilities is not 1.

• Yes, because the distribution is symmetric

Is the following a probability distribution?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, all probabilities are not be between 0 and 1 inclusive

• No, the sum of all the probabilities is not 1.

• Yes, because the distribution is symmetric

A marketing survey compiled data on the number of cars in households. If X = the number of cars in a randomly selected household, and we omit the rare cases of more than 5 cars, then X has the probability distribution shown. What is the probability that a randomly chosen household has at least two cars?

• 0.20

• 0.29

• 0.39

• 0.61

The table above shows a television station's advertisement sales. The distribution of sales for one 24-hour day is given. Solve for the mean. Round to the nearest hundredth.

• 31.80

• 15.68

• 0.20

• 1.00

The table above shows a television station's advertisement sales. The distribution of sales for one 24-hour day is given. Solve for the standard deviation. Round to the nearest hundredth.

• 35.76

• 268.1

• 16.3

• 1279.35

What is the mean of the probability distribution?

• 4.13

• 5.18

• 5.54

• 6.08

What is the variance of the distribution?

• 8.04

• 8.40

• 9.50

• 9.05