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**Measurable Discrete Continuous A failure Indeterminate**

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

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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? Y 1 2 3 Prob .55 .30 .10 .05 10 0.5 0.65 2.0 1.5

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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? Y 1 2 3 Prob .55 .30 .10 .05 10 1.15 0.853 0.652 2.0 1.5

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X and Y are independent random variables with expected values and standard deviations as shown. What is E(X – Y)? Exp. Value SD X 80 12 Y 3 10 92 68 34 83

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X and Y are independent random variables with expected values and standard deviations as shown. What is SD(X – Y)? Exp. Value SD X 80 12 Y 3 10 9 15 11.62 135 12.37

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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? 10 4” 2” 7.5” 1.5” 3”

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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? 10 1.5“ 7.5” 5.4” 2.25” 4”

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Variance and Standard Deviation The Expected Value of a random variable gives the average value of the distribution The Standard Deviation shows how spread.

Variance and Standard Deviation The Expected Value of a random variable gives the average value of the distribution The Standard Deviation shows how spread.

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