AP Stats Probability Distributions

A company states that 2% of its computers are returned for defects.  We take a sample of 100 computers to find the probability of 10 being defective.  Is this a binomial distribution?

• No because there is not a fixed number of trials.
• No because their are more than 2 outcomes.
• Yes since there are a fixed number of independent trials, outcomes in 2 categories, and the probability of defect is constant.
• No since computers would not be independent.

On an eight question multiple choice quiz with 4 answers for each question, what is the probability of guessing and getting 6 correct answers?

• .004
• .109
• .003
• .9996

On an eight question multiple choice quiz with 4 answers for each question, what is the probability of guessing and getting at least 7 correct answers?

• .00002
• .99998
• .0004
• .9996

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

The table represents the probability of guessing correct on a 5 question true-false quiz.  Is it unusual to get 0 correct?

• No, since the probability is less than or equal to .05.
• Yes, since the probability is less than or equal to .05
• No, since the probability is greater than .05.
• Yes, since the probability is greater than .05.

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)

The probability that Jalen makes a free throw is 75%. What is the probability he makes his first free throw on his third attempt?

• geometcdf(3, 0.75)
• geometpdf(0.75, 3)
• geometpdf(3, 0.75)
• geometcdf(0.75, 3) 

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 on the fifth house?

• 0.97

• 0.99

• 0.02

• 0.04