Chapter 5.1 AP Statistics

In an AP Statistics class, 57% of students eat breakfast in the morning, 80% of them floss their teeth, and 46% of the students do both.  What is the probability that a randomly chosen student eats breakfast but does not floss their teeth?

• 9%
• 11%
• 34%
• 91%

In an AP Statistics class, 57% of students eat breakfast in the morning, 80% of them floss their teeth, and 46% of the students do both.  What is the probability that a randomly chosen student eats breakfast or flosses their teeth?

• 91%
• 9%
• 11%
• 34%

A fair coin has come up "heads" 10 times in a row.  The probability that the coin will come up heads on the next flip is:

• greater than 50%, it's due to happen.
• 50%
• less than 50%, since tails is happening so much.
• Can't be determined

According to the National Telecommunication and Information Administration, 50.5% of U.S. households had internet access in 2001.  What is the probability that four randomly selected U.S. all had internet access in 2001?

• 6.5%
• 12.6%
• 49.5%
• 50.5%

Pepsi is running a sales promotion in which 12% of all bottles have a "FREE" logo under the cap. If you buy a 6-pack of bottles, what is the probability that you will find at least 1 "FREE" logo?

• 0.464

• 0.536

• 0.12

• 0

An ice cream stand owner reports that 12% of the cones they sell are "JUMBO" size. You want to see what a "JUMBO" cone looks like so you stand and watch the sales for a while. What is the probability that the first "JUMBO" cone isn't until the fourth cone you see them sell?

• 8%

• 33%

• 40%

• 60%

The probability of a tourist visiting an area cave is 0.7, and of a tourist visiting a nearby park is 0.6. The probability of visiting both places on the same day is 0.4. The probability that a tourist visits at least one of these two places is:

• 0.08

• 0.28

• 0.42

• 0.9

100 people were surveyed.  54 were female, and 46 were male.  33 of the females said they were democrats, and 30 of the males said they were republicans.  If a person is randomly selected, what is the probability that its a democrat?

• 49%
• 46%
• 54%
• 51%