Answer :
Set up a ratio of number of scores less than or equal to 82 over the total scores compared tot he percentile:
5/20 = P/100
Cross multiply:
20P = 500
Divide both sides by 20:
P = 25
Percentile rank is 25
Set up a ratio of number of scores less than or equal to 82 over the total scores compared tot he percentile:
5/20 = P/100
Cross multiply:
20P = 500
Divide both sides by 20:
P = 25
Percentile rank is 25