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# Let X = the number of dropped calls experienced per day by customers of a particular cell phone provider. This random v - PowerPoint PPT Presentation

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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Presentation Transcript
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

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

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

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

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

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

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