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Author Question: The following data represent the scores of 50 students on a statistics exam. The mean score is ... (Read 320 times)

Haya94

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on: Jun 24, 2018
The following data represent the scores of 50 students on a statistics exam. The mean score is 80.02, and the standard deviation is 11.9.
 
  39 51 59 63 66 68 68 69 70 71
  71 71 73 74 76 76 76 77 78 79
  79 79 79 80 80 82 83 83 83 85
  85 86 86 88 88 88 88 89 89 89
  90 90 91 91 92 95 96 97 97 98
 
  Use the z-score method to identify potential outliers among the scores.
 
  Answer the question True or False.
 
  What will be an ideal response?

Question 2

The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with a mean of 7. Find the probability that fewer than six tickets are written on a randomly selected day.
 
  A) 0.699292 B) 0.300708 C) 0.449711 D) 0.550289


amynguyen1221

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Reply #1 on: Jun 24, 2018
Answer to Question 1

The z-score of 39 is -3.46. Since this z-score is less than -3, the score of 39 is an outlier. All other scores have z-scores between -3 and 3, so there are no other outliers.

Answer to Question 2

B


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Haya94

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Reply #2 on: Jun 24, 2018
Thank you :)


amynguyen1221

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Reply #3 on: Jun 24, 2018
Happy to help you


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