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Author Question: In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a ... (Read 90 times)

Mollykgkg

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on: Jun 19, 2018
In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5 . Approximately what percentage of students have scores between 70 and 90?
 
  a. 68
  b. 80
  c. 95
  d. 99

Question 2

Karen's first psychology exam score is 1 standard deviation from the mean in a normal distribution. The test has a mean of 75 and a standard deviation of 5 . Karen's percentile rank would be:
 
  a. 16.
  b. 54.
  c. 70.
  d. cannot say from the information given


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fraziera112

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Reply #1 on: Jun 19, 2018
Answer to Question 1

c

Answer to Question 2

a


Mollykgkg

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Reply 2 on: Jun 19, 2018
Thanks for the timely response, appreciate it

frankwu0507

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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