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Let X = the number of dropped calls experienced per day by customers of a particular cell phone provider. This random variable is 10 1.Measurable 2.Discrete.

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Presentation on theme: "Let X = the number of dropped calls experienced per day by customers of a particular cell phone provider. This random variable is 10 1.Measurable 2.Discrete."— Presentation transcript:

1 Let X = the number of dropped calls experienced per day by customers of a particular cell phone provider. This random variable is 10 1.Measurable 2.Discrete 3.Continuous 4.A failure 5.Indeterminate

2 Let Y = the number of dropped calls experienced per day by customers of a particular cell phone provider. Y has the following probability distribution: What is the expected number of dropped calls per day? Y0123 Prob

3 Let Y = the number of dropped calls experienced per day by customers of a particular cell phone provider. Y has the following probability distribution: What is the standard deviation of dropped calls per day? 10 Y0123 Prob

4 X and Y are independent random variables with expected values and standard deviations as shown. What is E(X – Y)? Exp. ValueSD X8012 Y

5 X and Y are independent random variables with expected values and standard deviations as shown. What is SD(X – Y)? Exp. ValueSD X8012 Y

6 In North Carolina, heights of HS boy basketball players have mean 74 inches and standard deviation 4.5 inches, while girl players have a mean height of 70 inches and standard deviation 3 inches. At a mixed 2-on-2 tournament teams are formed by randomly pairing boys with girls as teammates. On average, how much taller do you expect the boy to be? ” 2.2” 3.7.5” 4.1.5” 5.3”

7 In North Carolina, heights of HS boy basketball players have mean 74 inches and standard deviation 4.5 inches; girl players have a mean height of 70 inches and standard deviation 3 inches. At a mixed 2-on-2 tournament teams are formed by randomly pairing boys with girls as teammates. What is the standard deviation of the difference in the heights of a boy and girl on a 2-person team? “ 2.7.5” 3.5.4” ” 5.4”


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