1. If random variable X follows a Normal probability
distribution, a negative Z score means
(a) The value of X is negative
(b) The value of X is less than the mean
(c) The value of X is greater than the mean
(d) the correlation between X and Z is negative
(e) none of the above.
2. Which of the following statements is not true about the
(a) The total area under the Normal Curve is 1.
(b) The area less than the mean is 0.5
(c) The area less than Z=-1 is the same as the area of the
area more than Z=1
(d) The Normal curve is symmetric
(e) All the above is true