Which is not a characteristic of a normal curve?

• A.mean=median=mode
• B.Mean +/-2.0 standard deviations = approximately 68% of the scores.
• C.The number of standard deviations from the mean that includes 50% of the scores is exactly the same regardless of the variable.
• D.Each end of the curve extends theoretically to infinity.
• E.Mean +/-3.0 standard deviations = approximately 99% of the scores.

Please write in sentences in how you got the answer. Thank you