A company is in the business of finding addresses of long-lost friends. The company claims to have a 70% success rate. Suppose that you have the names of six friends for whom you have no addresses and decide to use the company to track them. (a) Make a histogram showing the probability of r = 0 to 6 friends for whom an address will be found. (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (Round your standard deviation to two decimal places.) ? = friends ? = friends (c) What is the smallest number of names would you have to submit to be at least 96% sure that at least two addresses will be found? (Enter your answer as a whole number.) names
A company is in the business of finding addresses of long-lost friends. The company claims to have a 70% success rate. Suppose that you have the names of six friends for whom you have no addresses and decide to use the company to track them. (a) Make a histogram showing the probability of r = 0 to 6 friends for whom an address will be found. (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (Round your standard deviation to two decimal places.) ? = friends ? = friends (c) What is the smallest number of names would you have to submit to be at least 96% sure that at least two addresses will be found? (Enter your answer as a whole number.) names
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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A company is in the business of finding addresses of long-lost friends. The company claims to have a 70% success rate. Suppose that you have the names of six friends for whom you have no addresses and decide to use the company to track them.
(a) Make a histogram showing the probability of r = 0 to 6 friends for whom an address will be found.
(b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (Round your standard deviation to two decimal places.)
(c) What is the smallest number of names would you have to submit to be at least 96% sure that at least two addresses will be found? (Enter your answer as a whole number.)
names
(b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (Round your standard deviation to two decimal places.)
| ? = friends |
| ? = friends |
(c) What is the smallest number of names would you have to submit to be at least 96% sure that at least two addresses will be found? (Enter your answer as a whole number.)
names
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