At Least One Probability

What is "q" in the following scenario? A research team at Cornell University conducted a study showing that approximately 10% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to brain, diminishing cerebral functions. At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that at least one tie is too tight?

• 1/20

• 0.1

• 0.9

What is "q" in the following scenario? A quarterback has a incomplete passing percentage of 30%. What is the probability that he complete exactly 8 of his 20 passes?

• 8/20

• 0.3

• 0.7

What is "q" in the following scenario? 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? 

• 0.89

• 0.11

• 2/10

What is n in this equation?

• Number of trials

• Number of successes

• Number of failures

What is x in this equation?

• Number of trials

• Number of successes

• Number of failures

How do you set up equation for this one? 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 of getting exactly 2 of the first 10 blood donors has Type B blood? 

• (a)

• (b)

• (c)

How do you set up equation for this one? An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 3 questions correct?

• (a)

• (b)

• (c)

Which value of "x" is most likely?

• 6

• 7

• 3

• 3.5

A random variable is defined by a rule that assigns a _______________ to every outcome in a sample space.

• number

• letter

• Event

• probability

Two fair dice are rolled and the numbers that appear are added. What is the probability that this sum is at least 5?

• 5/12

• 5/36

• 5/6

• 1/6