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Which of the following statements are true?
I. The area under a normal curve is always equal to 1, no matter what the mean and standard deviation are.
II. The smaller the standard deviation of a normal curve is, the higher and narrower the graph.
III. Normal curves with different means are centered around different numbers.

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Answer Choices:
A) I and II
B) I and II
C) II and III
D) I, II, and III
E) None of the above.

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