Quiz 5 Solutions

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online