Why Use Z scores?. Percentages can be used to compare different scores, but don’t convey as much information
X-µ 142-100 z= 1.68
Area under curve ‘Small Part’ = .0465, equals those who scored above the prof;
1–.0465= 95.35th percentile. Oh so wise is in top 5% of all professors. Not bad at all.
Never use from mean to z only to find percentile!! We’re only concerned with scores below a certain rank