AP Statistics Unit 4

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125

• .15625

• .3125

• .1875

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean number of questions one gets correct when guessing.

• 2.5

• 3

• 3.5

• 1.5

P(Sandals):

• 16/22

• 20/36

• 5/9

• 20/16

The temperature in Glens Falls for the month of February is Normally distributed with a mean of 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of the days in February would be between 24 and 30 degrees?

• 35.8%

• 68.2%

• 0%

• 50%

Which represents the number of standard deviations from the mean for the 85th percentile?

• 2.58

• -2.58

• -1.04

• 1.04

The weights of adult male beagles are normally distributed, with a mean of 25 pounds and a standard deviation of 3 pounds. A beagle is randomly selected. Find the probability that the beagle’s weight is more than 29 pounds.

• 0.3694

• 0.3781

• 0.0912

Lilah flips a coin. What is the chance the coin comes up with the first tails in fewer than 5 flips?

• geometcdf(1/2, 5)

• geometpdf(1/2, 5)

• geometcdf(1/2, 4)

• geometpdf(1/2, 4)

What is the probability that a family doesn't have a baby girl until their third child?

• 0.13

• 0.15

• 0.05

• 0.88

If the probability that a house in your neighborhood has a dog is 60%, what is the chance that you find a house with a dog before the fifth house?

• 0.97

• 0.99

• 0.02

• 0.04

Which of the following is false about binomial probabilities?

• Their distributions are approximately symmetric.

• Trials must be fixed.

• Events musts be independent.

• The probability of success must be 0.50