The Welcher Intelligence Test Scale is composed of a number of subtests.  On one subtest, the raw scores have a mean of 45 and a standard deviation of 7.  Assuming these raw scores form a normal distribution:   What number represents the 65th percentile (what number separates the lower 65% of the distribution)? =   What number represents the 90th percentile? =   What is the percentage of getting a raw score between 28 and 38?   What is the percentage of getting a raw score between 41 and 44?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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  1. The Welcher Intelligence Test Scale is composed of a number of subtests.  On one subtest, the raw scores have a mean of 45 and a standard deviation of 7.  Assuming these raw scores form a normal distribution:

 

  1. What number represents the 65th percentile (what number separates the lower 65% of the distribution)? =

 

  1. What number represents the 90th percentile? =

 

  1. What is the percentage of getting a raw score between 28 and 38?

 

  1. What is the percentage of getting a raw score between 41 and 44?

 

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