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Chapter16

# Chapter16 - Chapter 16(Random Variables Skip More About...

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1 Chapter 16 (Random Variables) Skip: More About Means & Variances to the end of the chapter (pages 414-424) Activity 1: A researcher had collected some data over the course of several weeks from a nearby grocery store on the number of customers waiting in the express checkout line at 3pm. It was found that 10% of the time there were no customers waiting in line, 35% of the time the line had one customer waiting, 30% of the time the line had 2 customers, 15% of the time the line had 3 customers, 7% of the time the line had 4 customers, and 3% of the time the line had 5 customers waiting. Assume there were never more than 5 customers waiting. Let x : The number of customers waiting in the express checkout line A. Is this an experiment or an observational study? B. What is the sample space for x ? S = { Since the length of the waiting line (value of x ) varies depending on which day is randomly selected, we call X a random variable. Furthermore, note that x can take on only the values of
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