Quiz 5 Solutions

# Quiz 5 Solutions - BA 240 W Li Answer Sheet QUIZ 5 Solution...

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BA 240 W. Li Answer Sheet QUIZ 5 Solution Show your work CLEARLY and COMPLETELY! Draw the Normal Curves, highlight the corresponding areas! Round to SECOND Digits after Decimal Point for Z-scores Keep the Original FOUR Digits after Decimal Point for Probability Problem 1 : Stanford-Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 16. Find the probability that a randomly selected person has an IQ test score a) Over 140. 0062 . 4938 . 5 . ) 50 . 2 ( ) 16 100 140 ( ) 140 ( z p z p x p z-score of 140: 2.50 P(X > 140): .0062 b) Under 88. 2266 . 2734 . 5 . ) 75 . 0 ( ) 16 100 88 ( ) 88 ( z p z p x p z-score of 88: -0.75 P(X > 140): .2266 c) Between 72 and 128. 9198 . 2 4599 . ) 75 . 1 75 . 1 ( ) 16 100 128 16 100 72 ( ) 128 72 ( z p z p x p z-score of 72: -1.75 z-score of 128: 1.75 P(72<x<140): .9198 d)
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## This note was uploaded on 05/15/2011 for the course BA 240 taught by Professor Li during the Spring '08 term at Bellevue College.

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