Average stdev average stdev 95 of data are within the

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Average ‑ StDev, Average + StDev]95% of data are within the interval[Average ‑ 2*St Dev, Average + 2*StDev]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?
12/15/2016WebCOM™ 2.011/12Type:Multiple ChoicePoints Awarded:5/5
Question 14: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]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?Type:Multiple ChoicePoints Awarded:5/5
12/15/2016WebCOM™ 2.012/1295% of the students scored between 20.2 and 28.6

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