Lecture25[1]

Lecture25[1] - Lecture 25 Normal Distribution Section 6.2...

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Normal Distribution Section 6.2 Lecture 25
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Percentiles The p th percentile is the value such that at least p percent of the observations are less than or equal to this value and at least (100- p ) percent of the observations are greater than or equal to this value. Example: If you scored in the 90 th percentile on the verbal part of your SAT’s, this would mean that you scored above 90% of all verbal scores taken for the SAT’s at that time.
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Percentiles
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Example 1 The Graduate Record Examinations (GRE) are widely used to help predict the performance of applicants to graduate schools. The range of possible scores on a GRE is 200 to 900. The psychology department at a university finds that the scores of its applicants on the quantitative GRE are approximately normal with mean 544 and standard deviation 103.
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Example 1 Suppose an applicant needs to score better than 77% of all GRE test takers to get accepted into this university. What is the minimum score required to meet this criteria?
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Example 1 ( ) 0.77 P Z z
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Lecture25[1] - Lecture 25 Normal Distribution Section 6.2...

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