Binomial Probabilities

If you were to flip a coin 20 times, what is the probability you would get exactly 10 heads?

• 50%
• 17.62%
• .58.81%
• 41.19%

A quarterback has a incomplete passing percentage of 30%. What is the probability that he does not complete exactly 8 of his 20 passes?

• 11.44%

• 12.45%

• 54%

• 12.34%

True or False:
exactly = binompdf
at most = binomcdf
at least = 1-binomcdf  

• True
• False

The probability of winning is 1/3.  Bob plays 6 games. Find P(win exactly 5 games):

• .6803
• .0178
• .0164
• .9986

MC test with 4 choices per question.  Find probability of getting exactly 5 out of 12 questions correct.  Which of the following is used to find the probability?

• binompdf
• binomcdf
• 1−binomcdf
• 1-binompdf

MC test with 4 choices per question find probability of getting at most 5 out of 10 questions correct.  Which of the following would be used?

• binompdf
• binomcdf
• 1−binomcdf
• 1-binompdf

MC test with 4 choices per question, find the probability of getting exactly 7 out of 10 questions correct. Which of the following is the correct binomial?

• binompdf (10, 0.25, 7)
• binompdf (10, 0.70, 4)
• 1−binomcdf(10, 0.70, 7)
• 1-binompdf(10, 0.25, 7)

19. A new bacteria has found its way to ECU and 85% of the Pirates are infected. If we select 100 Pirates,find the probability that less than 80 Pirates are infected.

(Hint: Binomcdf, less than 80 means less than or equal to 79)

• 0.0663

• 0.1628

• 0.1065

• 0.8935

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? (You need to figure out the p value first. It is not given to you.)

• 96.2%
• 13.2%
• 8.31%
• 25.0

Barry Bonds has a career batting average of .298.  What is the probability that he will get on base 6 times in 10 at bats?

• 3.58%
• 5.46%
• 22.67%
• 100%