Math 3 College Prep Unit 10 Worksheet 3

Name:____________________________________ Date:___________________ Period:______

1. A set of 100 values has a normal distribution. The mean of the data is 30 and the standard deviation is 5. A. Sketch a normal curve that represents the information. B. How many values are within one standard deviation of the mean? C. What percent of data is between 20 and 40? D. What interval contains 99.7% of the data? E. Find the probability of a value less than 43. F. Find the probability of a value greater than 23. G. Find the probability of a value between 27 and 37. H. What value is at the 85th percentile? 2. Air passengers traveling through Atlanta have an average layover of 102 minutes with a standard deviation of 17.5 minutes. A. Sketch a normal curve that represents the information. B. What percent of the passengers have layovers of 67 to 137 minutes? C. What percent of data is between 84.5 and 119.5 minutes? D. What percent of the passengers have layovers below 90 minutes? E. What percent of the passengers have layovers over140 minutes? F. How many minutes would a layover be to be in the 80th percentile?. G. What percent of passengers have layovers between 65 and 75 minutes? 3. N(74 , 21) A. Sketch a normal curve that represents the information. B. What is the probability of a point falling below 120? C. What is the probability of a point falling above 60? D. What is the probability of a point falling between 49 and 110? E. State the point for the 90th percentile.

4. For the following list of test scores for a math class. 52, 99, 102, 33, 57, 75, 100, 81, 62, 79, 85, 83, 71, 68, 62, 94, 96 a) Find the mean, standard deviation, and the approximate margin of error.

b) Interpret the margin of error in terms of test scores for the class.

5. The data set below gives the numbers of home runs for the 10 batters who hit the most home runs during the 2005 Major League Baseball regular season. 51, 48, 47, 46, 45, 43, 41, 40, 40, 39

a) Find the mean, standard deviation, and the approximate margin of error.

b) Interpret the margin of error in terms of number of home runs during the MLB regular season.

6. The following are the heights of the ten tallest (in inches) men living or dead in the world: 98, 98, 98, 99, 99, 99, 101.5, 103.75, 104, 107.1 a) Find the mean, standard deviation, and the approximate margin of error.

b) Interpret the margin of error in the context of the problem.

Unit 10 Math 3 CP Worksheet 3--z-Scores, percentiles, margin of error ...

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