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Author Question: The scores on a midterm test in a college mathematics course were found to be normally distributed ... (Read 145 times)

cherise1989

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on: Jul 25, 2018
The scores on a midterm test in a college mathematics course were found to be normally distributed with a mean of 78 and a standard deviation of 9.
 
  a. What percentage of students scored between 69 and 96?
  b. Find the range of scores that includes the middle 50 of all scores.

Question 2

Do you believe that grain yield is correlated with the amount of fertilizer applied? If so, will the correlation be positive or negative? Explain.
 
  What will be an ideal response?


aruss1303

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Reply #1 on: Jul 25, 2018
Answer to Question 1

a. 81.85
b. approximately 72 to 84

Answer to Question 2

yes; positive (within reason; if too much fertilizer is applied, the yields will decrease.)


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cherise1989

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Reply #2 on: Jul 25, 2018
Thank you!


aruss1303

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Reply #3 on: Jul 25, 2018
Always glad to help...


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