Find the z-scores for which 98% of the distribution's area lies between - z and z.

How is the answer (-2.33, 2.33) ?

On a normal or bell shaped curve, these two z scores are symmetric to one another about zero, which is exactly in the center. The area between these two Z scores is equal to. 98 These Z scores correspond to percentiles. So the - 2.33 represents the. 0099 percentile, and 2.33 represents. 9901 percentile. 9901-.0099 roughly equals. 98.

These Z scores are the result of "normalization." If you haven't gotten into that, I don't think I should explain it here. It requires integration and probably a specific example involving repeated trials of an experiment to explain it thoroughly, but it springs from the central limit theorem.