Discrete Probability Distribution

An urn contains 3 red ball and 5 green balls. You randomly choose 4 balls. Which distribution can be use to find out the probability that you choose exactly 2 red balls?

• Uniform

• Binomial

• Geometric

• Hypergeometric

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 

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

Find the mean of a binomial distribution with n=50 and p=0.4

• 50

• 4

• 20

• 10

Paul expected to receive 4 emails in a week.Find the probability of receiving 6 emails for the next 2 weeks?

• 0.1221

• 0.1912

• 0.3134

• 0.6866

• 0.8088

The number of cars randomly arriving at a car wash during a 20-minute interval.

• Poisson

• Binomial

• Geometric

• Hyper geometric

If electricity power failures occur with an average of 3 failures every twenty weeks, calculate the probability that there will not be more than one failure during a particular week.

• Poisson

• Binomial

• Geometric

• Hyper geometric

If Mobius draws 7 cards out of a deck with replacement, what is the probability that he gets the first heart in 6 attempts or fewer?

• 0.18

• 0.82

• 0.06

• 0.76

Which distribution is described by predicting the number of girls among 10 children randomly selected from a group of 16 girls and 12 boys?

• Binomial

• Uniform

• Hypergeometric

• Geometric

In a given week, the probability that a certain company experiences a network failure is 10%. Which distribution can be use to find out the probability that the company will experience 5 weeks without a network failure?

• Uniform

• Binomial

• Geometric

• Hypergeometric