Which of the following statements is NOT true? A) two normal curves can have the same mean, but different standard deviations.
B) if a data set is normal, 68% of the data is within one standard deviation of the mean.
C) the standard normal deviation has a mean = 0 and standard deviation = 1.
D) the area under every normal curve is 1, no matter the values of the mean and standard deviation
E) all the above are true.