Which of the folding 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 = o 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

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?