Calculating a math score
Math Scores average = 535, SD=100
Estimate the 95th Percentile Range.
95% of a Curve in SU is going to be 90%
- Calculation:
- the 95% is between +-90% (or +-1.65) We want area all the way to the right of 95%.
- To get the other area to the right you would have to subtract 5% (100%-95% = 5%). leaving you with 90%
90% area = 1.65 SD
To get the score you would multiply 1.65 SU by the SD of 100, and add it to the average (535)
1.65x 100 = 165 +535(ave) = 700
- Note:
- A percentile is a score 95th percentile = 700
A percentile rank, however is a percentage. If you score 700 on a test it puts you in the 95% percentile rank