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Which of the following describes a set of data whose histogram approximates a normal curve?

Check all that apply.
  		A. 	Most of the observations are near the mean of the data set.
  		B. 	The histogram of the data is exactly the same as the normal curve.
  		C. 	The observations trail off at values far from the mean.
  		D. 	All of the data values have to be positive.
  		E. 	The sum of the data values must be 1.