# For typical data sets the following rules of thumb hold: 65% of data are within the...

###### Question:

For typical data sets the following rules of thumb hold:

65% of data are within the interval [Average - StDev, Average + StDev] 95% of data are within the interval [Average - 2*St Dev, Average + 2*StDev]

13. A recent ACT administered to a local high school yielded the following results:
Mean = 24.4 and Standard Deviation = 4.2. Which of the following is true? (5 points)

• a. 65% of the students scored between 16 and 32.8
• b. 95% of the students scored between 16 and 33.8
• c. 65% of the students scored between 20.2 and 28.6
• d. 95% of the students scored between 20.2 and 28.6

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