Statistics Unit 5

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) 

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

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at least 2 of the first 10 blood donors has Type B blood? 

• 0.088

• 0.697

• 0.214

• 0.303 

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school.What is the probability that exactly 2 of the first 20 blood donors have Type B blood? 

• 0.316

• 0.282

• 0.001

• Not here

• 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

Mary is a good student. The overall probability that she studies is 0.80. The probability that she studies and that she passes her test is 0.60. What is the probability that she passes given that she studies?

• 0.75

• 0.25

• 0.20

• 0.60

What is the probability that they speak French given they are a girl? 

• 2.14

• .24

• .4

• .8571

P(Freshman or Pizza):

• 27/50

• 4/50

• 3/50

• 2/11

Given P(A) = .8 and P( B| A) = .3, find P( A and B).

• 2.6

• .12

• .24

• .38

If A and B are mutually exclusive, which statement below must be true?

• P(A∩B) = 0

• P(A|B) = 0

• P(A∪B) = 0

• P(A) + P(B) = 1