If a Class's Scores Are Normally Distributed,with a Mean of 70

question 16

Multiple Choice

If a class's scores are normally distributed,with a mean of 70 and a standard deviation of 10,what are the upper and lower limits of the middle 68% of the class?

• A)50 and 90
• B)40 and 100
• C)60 and 80
• D)32 and 68

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