AP Stats Unit IV Review

What is the probability that a student from this class eats breakfast but does not floss their teeth?

• .09

• .11

• .34

• .57

• .91

What is the probability that a student from this class eats breakfast or flosses their teeth?

• 9%

• 11%

• 34%

• 91%

Tags

CCSS.HSS.CP.B.7

Five juniors and four seniors have applied for two open student council positions. School administrators have decided to pick the two new members randomly. What's the probability they are both juniors or both seniors?

• 0.444

• 0.506

• 0.569

• 0.722

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

• less than 50%, since "tails" is due to come up.

• 50%

• greater than 50%, since it appears that we are in a streak of "heads".

• It cannot be determined.

Tags

CCSS.HSS.CP.A.5

According to the National Telecommunication and Information Administration, 56.5% of US households owned a computer in 2001. What is the probability that of three randomly selected US households at least one owned a computer in 2001?

• 18%

• 43.5%

• 56.5%

• 82%

• 91.8%

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

• 6.5%

• 12.6%

• 49.5%

• 50.5%

• 93.5%

Which of these has a Binomial model?

• The number of people we survey until we find someone who has taken statistics.

• The number of people we survey until we find two people who have taken statistics.

• The number of people in a class of 25 who have taken statistics.

• The number of aces in a five-card Poker hand.

• The number of sodas students drink every day.

Tags

CCSS.HSS.MD.A.3

CCSS.HSS.MD.A.4

Which of these has a Geometric model?

• the number of people we survey until we find someone who has taken statistics

• the number of people we survey until we find two people who have taken statistics

• the number of people in a class of 25 who have taken statistics

• the number of aces in a five-card poker hand

• the number of sodas students drink every day

BatCo, a company that sells batteries, claims that 99.5% of their batteries are in working order. How many would you expect to buy, on average, to find one that doesn't work?

• 5

• 100

• 200

• 995

• 2000

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

Some marathons allow two runners to "split" the marathon by each running a half marathon. Alice and Sharon plan to split a marathon. Alice's half-marathon times average 92 minutes with a standard deviation of 4 minutes, and Sharon's half-marathon times average 96 minutes with a standard deviation of 2 minutes. Assume that the women's half-marathon times are independent. The expected time for Alice and Sharon to complete the full marathon is 92+96=188minutes. What is the standard deviation of their total time?

• 2 minutes

• 4.5 minutes

• 6 minutes

• 20 minutes

• It cannot be determined