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Percentile ranks are not on an equal-interval scale; that is, the difference between any two scores is not the same as between any other two scores whose difference in percentile ranks is the same. For example, 50 − 25 = 25 is not the same distance as 60 − 35 = 25 because of the bell-curve shape of the distribution.
MESA Percentile Total HDL particles μmol/L Interpretation >75% >34.9 Those with highest (Optimal) total HDL particle concentrations & lowest rates of cardiovascular disease events 50–75% 30.5–34.5 Those with moderately high total HDL particle concentrations & moderate rates of cardiovascular disease events 25–50% 26.7–30.5
Most IQ tests are designed to yield a mean score of 100 with a standard deviation of 15; the 98th-percentile score under these conditions is 130.8, assuming a normal distribution. [14] However, American Mensa does not provide a score comparable to scores on other tests; the test serves only to qualify a person for membership. [15]
In statistics, a k-th percentile, also known as percentile score or centile, is a score (e.g., a data point) below which a given percentage k of arranged scores in its frequency distribution falls ("exclusive" definition) or a score at or below which a given percentage falls ("inclusive" definition); i.e. a score in the k-th percentile would be above approximately k% of all scores in its set.
For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%. Shown percentages are rounded theoretical probabilities intended only to approximate the empirical ...
MESA Percentile LDL particles nmol/L Interpretation 0–20% <1,000 Those with lowest rate of cardiovascular disease events & low (optimal) LDL particle concentration 20–50% 1,000–1,299 Those with moderate rate of cardiovascular disease events & moderate LDL particle concentration 50–80% 1,300–1,599
Colleges often use class rank as a factor in college admissions, although because of differences in grading standards between schools, admissions officers have begun to attach less weight to this factor, both for granting admission, and for awarding scholarships.
Those are listed below by selectivity percentile (assuming the now-standard definition of IQ as a standard score with a median of 100 and a standard deviation of 15 IQ points). Since the 1960s, Mensa has experienced increasing competition in attracting high-IQ individuals, as various new groups have emerged with even stricter and more exclusive ...