The data shown represent the scores on a national achievement test for a group of 10th grade students.
Find the approximate percentile ranks of these scores by constructing a percentile graph (Ogive).
Use the Ogive, estimate percentile of a student who scored 200 points in the test? What is the student
score must be in order in the 90 percentile?
Score
classes
Freq. Score
upper
limit
Cumulative
Freq.
Relative
Cumulative
Freq.
< 196.5 0 < 196.5
196.5 – 217.5 5 < 217.5
217.5 – 238.5 17 < 238.5
238.5 – 259.5 22 < 259.5
259.5 – 280.5 48 < 280.5
280.5 – 301.5 22 < 301.5
301.5 – 322.5 6 < 322.5
Total 120