StatTutor Lesson - Discrete Probability Models

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      Questions 1-2

      101

      Question 1.

      Consider the variable Joe’s weight next Friday. Is this discrete?

      A.
      B.

      Correct. Variables like height and weight are not discrete. People typically round their actual weight (which can be measured in pounds, ounces, and fractions of ounces – whatever the accuracy of your scale is) to the nearest 5 or 10 pounds.
      Incorrect. Variables like height and weight are not discrete. People typically round their actual weight (which can be measured in pounds, ounces, and fractions of ounces – whatever the accuracy of your scale is) to the nearest 5 or 10 pounds.
      2
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      Questions 3-5

      278

      Question 3.

      Motor Vehicles table image

      Above is a probability distribution for the number of motor vehicles (cars, trucks, or motorcycles) owned by a random family. Because almost no families own more than five, we will combine any families with more than five into that value. What is the probability a randomly selected family has at least three vehicles?

      Correct. The probability of owning at least three (3 or more) vehicles is 0.28 + 0.09 + 0.05
      Incorrect. The probability of owning at least three (3 or more) vehicles is 0.28 + 0.09 + 0.05
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