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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 . Measurable Discrete Continuous A failure Indeterminate. 10.

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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

  • Measurable

  • Discrete

  • Continuous

  • A failure

  • Indeterminate

10


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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?

  • 0

  • 0.5

  • 0.65

  • 2.0

  • 1.5

10


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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?

  • 1.15

  • 0.853

  • 0.652

  • 2.0

  • 1.5

10


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

  • 92

  • 68

  • 34

  • 83

10


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

  • 9

  • 15

  • 11.62

  • 135

  • 12.37

10


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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?

  • 4”

  • 2”

  • 7.5”

  • 1.5”

  • 3”

10


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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?

  • 1.5“

  • 7.5”

  • 5.4”

  • 2.25”

  • 4”

10


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