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Columbus State Community College STAT 1350: Elementary Statistics  Normal Distribution 1)Students taking an introductory statistics class reported spending an average of $205 on textbooks that semester with a standard deviation of $60

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Columbus State Community College

STAT 1350: Elementary Statistics 

Normal Distribution

1)Students taking an introductory statistics class reported spending an average of $205 on textbooks that semester with a standard deviation of $60. A rough sketch of the histogram looked like:

 

 

 

 

 

 

 

 

 

 

 

1. 68% of students spend between 145 and 265.

 

2. 95% of students spend between 85 and 325.

 

3. 99.7% of students spend between 25 and 385.

 

4. Approximately what percentage of the students spent between $175 and $250 on textbooks that semester?

 

 

 

 

 

 

 

 

5. One student spent $187 on textbooks. What percentage of the students spent less than she did on textbooks that semester?

 

 

 

 

 

 

 

 

 

 

 

6. 10% of students spend less than $127 on textbooks.

 

 

 

 

7. 35% of students spend more than $283 on textbooks.