Author Question: The scores on a midterm test in a college mathematics course were found to be normally distributed ... (Read 143 times)

cherise1989

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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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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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