习题：
　　Exercise:
　　Assume that a random variable follows a normal distribution with a mean of 80 and a standard deviation of 24. What percentage of this distribution is not between 32 and 116?
　　A      4.56%
　　B      8.96%
　　C     13.36%
　　D     18.15%
　　解析：
　　Answer: B
　　Explanation:
 
　　相关知识点：
　　Standard Normal Distribution
　　The standard normal distribution is the normal distribution with mean m = 0 and variance s2 = 1.
　　Suppose X is normally distributed with mean m and variance s2, then X is standardized by subtracting its mean and dividing by its standard deviation.
 
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