1. The scores on a nationwide mathematics aptitude exam are normally distributed, with µ = 80 and σ = 12.

What is the percentile rank of a score of 84?
What percentage of scores fall between 64 and 90?
What percentage of aptitude scores are below a score of 66?
What percentage of scores fall between 64 and 90?
Find the percentage of aptitude scores falling between the scores of 95 and 110.