# B use the 68 95 997 rule to find the proportion of

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(b) Use the 689599.7 rule to find the proportion of applicants whose score is between 338and 853.(c) What proportion of GRE scores are below 500?(d) What proportion of GRE scores are above 800?(e) Calculate and interpret the 34th percentile of the distribution of applicants’ GRE scores.
72The Practice of Statistics, 4/e- Chapter 2© 2011 BFW Publishers2.(a) Find the proportion of observations from a standard Normal distribution that satisfies0.51 <Z< 2.84.Sketch the Normal curve and shade the area under the curve that is theanswer to the question.(b) Whatz-score in a Normal distribution has 22% of all scores above it?3.A Normal probability plot for the weights of 40 squirrels trapped and released on a collegecampus is shown below.Is the distribution of squirrel weights approximately Normal?Justify your answer.262524232221201918210-1-2Squirrel weight (oz.)z-Score
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 273Quiz 2.2CAP StatisticsName:1.Approximate the median, mean, and standard deviation of the Normal distribution graphedbelow.Median: __________Mean:__________Standard Deviation:__________2.The scores of a reference population on the Wechsler Intelligence Scale for Children (WISC)are approximately Normally distributed withμ= 100 andV= 15.(a) What score would represent the 50th percentile?Explain.(b) A score in what range would represent the top 1% of the scores?(c) What proportion of the reference population has WISC scores below 110?(d) What proportion of the reference population has WISC scores between 80 and 110?450400350300250200150100500-50-100Score
74The Practice of Statistics, 4/e- Chapter 2© 2011 BFW Publishers3.The weights of healthy adult male Labrador Retrievers are approximately Normallydistributed with a mean of 77 pounds and a standard deviation of 6 pounds.What is theinterquartile range of male Labrador weights?4.Twenty students were asked to guess the age of a man in a photograph.Here are theirguesses:44434837444033425049434646454338Are these guesses approximately Normally distributed?Provide evidence to support youranswer.43413941
Test 2AAP StatisticsName:Part 1:Multiple Choice.Circle the letter corresponding to the best answer.1.The heights of American men aged 18 to 24 are approximately Normally distributed with amean of 68 inches and a standard deviation of 2.5 inches.Only about 5% of young men haveheights outside the range
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 275

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