Z = (33 - 36) / 4.5 = -.67
Drawing the figure shows that the Z-score is below the mean.
We look up .67 in the standard normal table. Since we are below the
mean, we want to find the proportion beyond that Z-score.
That proportion is .2514.
Therefore, the percentile rank is (.2514)*100 = 25% (rounded to the
nearest whole number).