Exercise:
　　Given the following data for a market variable, what is the best estimate of its variance?
　　A.       6
　　B.       10
　　C.      32
　　D.      97
　　解析：
　　Answer: D
　　Explanation:
　　知識點：
　　Expected Value and Variance
　　The expected value (aka. mean) is the weighted average of the possible outcomes of a random variable, where the weights are the probabilities that the outcomes will occur.
 
　　If X and Y are any random variables:
　　The variance provides a measure of the extent of the dispersion in the values of the random variable around the mean. The square root of the variance is called the standard deviation.
 
　　The mean and standard deviation measure two important features of a distribution: its center (the mean) and its spread (the standard deviation).
 

 
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