Exam 8: Random Variables and Probability Models

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Internet service providers (ISP) need to resolve customer problems as quickly as possible. For one ISP, past data indicate that the likelihood is .80 that customer calls regarding Internet service interruptions are resolved within one hour. Out of the next 10 customer calls about interrupted service, a. What is the probability that exactly 7 will be resolved within one hour? b. What is the probability that at least 7 will be resolved within one hour? c. How many customers would be expected to have their service problems resolved within one hour?

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Question 21

Use the appropriate probability model (Binomial). -It is estimated that 20% of luxury cars manufactured in 2008 were silver. A car Dealership typically sells 20 luxury cars per month. The probability that more than 10 of The luxury cars sold per month are silver is

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Question 22

Use the appropriate probability model (Binomial). -It is estimated that 20% of luxury cars manufactured in 2008 were silver. A car Dealership typically sells 20 luxury cars per month. The probability that 8 of the luxury Cars sold per month are silver is

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Question 23

Use the appropriate probability model (Poisson). -For quality control purposes, a company that manufactures copper sheets routinely Takes samples from its production process. Since its product is often used for decorative Purposes, one inspection check involves counting the number of imperfections or flaws On sheets that measure 36 sq. ft. Suppose the average number of imperfections per sheet Of this size is 3. What is the probability that a sheet of this size has no more than 2 Imperfections?

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Question 24

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Use the appropriate probability model (Binomial). -It is estimated that 20% of luxury cars manufactured in 2008 were silver. A car Dealership typically sells 20 luxury cars per month. The probability that more than 10 of The luxury cars sold per month are silver is

Use the appropriate probability model (Binomial). -It is estimated that 20% of luxury cars manufactured in 2008 were silver. A car Dealership typically sells 20 luxury cars per month. The probability that 8 of the luxury Cars sold per month are silver is

Data

Surveys and Sampling

Displaying and Describing Categorical Data

Displaying and Describing Quantitative Data

Correlation and Linear Regression

Randomness and Probability

The Normal Distribution

Confidence Intervals for Means

Confidence Intervals for Proportions

Confidence Intervals for Means

Testing Hypotheses

Comparing Two Groups

Inference for Counts: Chi-Square

Inference for Regression

Understanding Residuals

Multiple Regression

Data

Business Statistics

Decision Making and Risk

Introduction to Data Mining

Exploring and Collecting Data

Modeling With Probability

Inference for Decision Making

Models for Decision Making

Selected Topics in Decision Making

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