# Binomial Probability Worksheet II

Binomial Probability Worksheet II

Given the number of trials and the probability of success, find the mean, standard deviation, and the probability of:

1. [pic]

2. [pic]

3. [pic]

4. [pic]

5. [pic] find P(3 failures)

6. [pic] find P(1 failure)

7. [pic] find P(at least 3 successes)

8. [pic] find P(no more than 3 successes)

Find the probability of the Binomials given.

9. In a history class, Colin and Diana both write a multiple choice quiz.

There are 10 questions. Each question has five possible answers. What is

the probability that

a) Colin will pass the test if he guesses an answer to each question.

b) Diana will pass the test if she studies so that she has a 75% chance of answering each question correctly.

10. The manufacturing sector contributes 17% of Canada’s gross domestic

product. A customer orders 50 components from a factory that has a

99% quality production rate (99% of the products are defect-free). Find

the probability that:

a) none of the components in the order are defective

b) there is at least one defective product in the order.

c) There are at least two defective products in the order.

11. Approximately 3% of the eggs in a store are cracked. If you buy two

dozen eggs, what is the probability that

a) none of your eggs are cracked

b) at least one of your eggs is cracked

c) exactly two of your eggs are cracked

12. The probability the Tim will sink a foul shot is 70%. If Tim attempts 30

foul shots, what is the probability that

a) he sinks exactly 21 shots

b) he sinks at least 21 shots

c) he sinks at most 21 shots

d) he sinks between 18 and 20 shots, inclusive.

ANSWERS:

1. m=2.4, sd=1.386

2. m=4, sd=1.549

3. m=10, sd=2.236

4. m=13.5, sd=1.162

5. m=.55, sd=.723 [pic]

6. m=14.85, sd=.385 [pic]

7. m=2.1, sd=1.168 [pic]

8. m=1, sd=.995 [pic]

9. a) [pic] b) [pic]

10. a) [pic] b) [pic] c) [pic]

11. a) [pic] b) [pic] c) [pic]

12. a) [pic] b) [pic] c) [pic] d) [pic]

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