The percentile rank of a score is the percentage of scores in its frequency distribution that are equal to or lower than it. For example, a test score that is greater than or equal to 75% of the scores of people taking the test is said to be at the 75th percentile rank.ome percentile ranks are closer to some than others. Percentile rank 30 is closer on the bell curve to 40 than it is to 20. The mathematical formula is. where c â is the count of all scores less than the score of interest, Æ i is the frequency of the score of interest, and N is the number of examinees in the sample.
Best Answer: 1. Find the center of the circle. 2. Set your compass to the radius of the circle. 3. Pick one point on the circumference of the circle and use your compass to divide the circumference into six equal pieces. 4. Draw those six radii. 5. Bisect each one of those angles.(Or bisect just one of the angles and then transfer that angle to the other sixths.. Set your compass to the radius of the circle. 3. Pick one point on the circumference of the circle and use your compass to divide the circumference into six equal pieces. 4. Draw those six radii. 5. Bisect each one of those angles.
The problem of angle trisection reads: Construct an angle equal to one-third of a given arbitrary angle (or divide it into three equal angles), using only two tools: 1  an unmarked straightedge and. 2  a compass.sing only an unmarked straightedge and a compass, Greek mathematicians found means to divide a line into an arbitrary set of equal segments, to draw parallel lines, to bisect angles, to construct many polygons, and to construct squares of equal or twice the area of a given polygon.