Chapter 1+2 Practice - 3 Assume the following are the...

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AP Statistics – Chapter 1-2 Practice 1. Consider the distribution described by the line y = x, starting at the origin. (a) Draw the graph of the distribution, clearly identifying the endpoint and median. (b) Find the first quartile (Q1) of the distribution. Label the x-value of Q1 and draw it on the graph. (c) What percentage of the distribution lies below x = 0.3? 2. Assume the scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. (a) What percentage of students get scores in the range 70-90? (b) What score would be needed to get in the top 5%? (c) What percentage of students score above 100?
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Unformatted text preview: 3. Assume the following are the heights of the boys in a high school class: 6’1”, 5’6”, 5’9”, 5’7”, 6’0”, 5’5”, 5’11”, 5’10”, 5’9”, 5’8”, 6’3”, 5’9”, 5’7”, 5’10” (a) What are the mean and standard deviation of the heights? (b) What is the five number summary for the heights? (c) Graph the data and give a justification for you choice of graph type. 4. Assume that shoe size for 18 year old males is normally distributed with a mean of 9.5. If John is at the 95 th percentile in shoe size with a size 13 shoe, what is the standard deviation of the distribution?...
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