StatTutor Lesson - Binomial Mean and Standard Deviation

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Binomial mean and standard deviation
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      Questions 1-4

      124

      Question 1.

      At a large university, 23% of students come from out-of-state. If we sample 25 students at random, what is the mean (expected number) of out-of-state students in this sample? Give your answer using two decimal places.

      Correct. The mean (expected value) is μ = np = 25*0.23.
      Incorrect. The mean (expected value) is μ = np = 25*0.23.
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      Questions 5-6

      356

      Question 5.

      If we have n = 25 and p = 0.7, we will expect the shape of the distribution to be

      A.
      B.
      C.

      Correct. Because p is larger than 0.5 and n is fairly small, we will expect a somewhat left-skewed shape.
      Incorrect. Because p is larger than 0.5 and n is fairly small, we will expect a somewhat left-skewed shape.
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