You Recently Took a Statistics Exam in a Large Class

question 23

Multiple Choice

You recently took a statistics exam in a large class with n = 500 students. The instructor tells the class that the scores were Normally distributed, with a mean of 72 (out of 100) and a standard deviation of 8, but when you talk to other students in the class, you find out that more than 30 students have scores below 45. That violates which rule for the Normal distribution?

• A)the 1-2-3 rule
• B)the 30-60-90 rule
• C)the 68-95-99.7 rule
• D)It does not violate any rule; anything can happen.

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