3. A variable X is normally distributed, and it is transformed to a normal deviate Z. Using the Excel function NORMSDIST, determine the proportion of Z values in this normal distribution less than a Z value of 2.0: ____________. From this answer determine the proportion of Z values: a. more than 2.0 standard deviations above the mean: b. more than 2.0 standard deviations below the mean: c. within 2.0 standard deviation of the mean: d. more than 2.0 standard deviations from the mean