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# # 9 - Due Thursday November 8 2007 11:59 PM EST Description...

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Due: Thursday, November 8, 2007 11:59 PM EST Current Score: 29 out of 30 Question Score Submission Options Description Homework 9 covers normal distributions and their application to various real-world situations. Instructions Homework #9 Homework 9 is DUE 11:59pm THURSDAY NOVEMBER 8. You are allowed 4 submissions. 1. 2/3 points Last Response | Show Details All Responses Notes Question 1. What is the first quartile Q 1 of the standard normal distribution? -.675 (use 3 decimal places in your answer) Question 2. What is the third quartile Q 3 of the standard normal distribution? .675 (use 3 decimal places in your answer) Question 3. What percent of the observations in the standard normal distribution are suspected outliers according to the Q 1 - 1.5xIQR and Q 3 + 1.5xIQR cutoff criteria that we used when constructing boxplots? (Note that this percent is the same for any normal distribution.) 74.870 % (use 3 decimal places in your answer). (Note that the answer is requested as a percent ) 2. 5/5 points Last Response | Show Details All Responses Notes

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Suppose that the scores of a reference population on the Wechsler Intelligence Scale for Children (WISC) can be modeled by a normal distribution with mean 99 and standard deviation 17 . Question 1 . What is the probability that a child has a WISC score below 76.4 ? (use 4 decimal places in your answer) 0.0918 Question 2 . What is the probability that a child has a WISC score above 144.4 ? (use 4 decimal places in your answer) .0038 Question 3 . What is the probability that a child has a WISC score between 99 and 121.6 ? (use 4 decimal places in your answer) 0.4082 Question 4 . What are the quartiles of WISC scores?
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