2.1 - Percentile

2.1 - Finding percentiles

Intro to stats

Percentile - A definition

• Have you ever heard someone say, "My score was in the 99th percentile" when referring to a score on a test?

• What does this really mean?

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Let's first answer a familiar question... what percent of students scored less than 84% on the quiz? There are 32 students in the class.

(Include percent sign)

Draw

Now, take this percentage, and round it to a whole number

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So, if Mr. Broncato got an 84% on the test, his score was in the

th percentile

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Lets think... What score on the quiz would a student have to have gotten in order to be above the 90th percentile (32 students)

Now lets answer some questions!

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Martin is the student that had 22 pairs of shoes, find Martin's percentile

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Luis is at the first quartile of the distribution (Q₁), how many pairs of shoes does he have?