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Statistics Module 3 All problems




Question;The math grades on the final exam varied greatly. Using the scores below, how many scores were within one standard deviation of the mean? How many scores were within two standard deviations ofthe mean? 1.99 34 86 57 73 8568 85 8991 93 4696 88 79The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?3. If you know the standard deviation, how do you find the variance?4. To get the best deal on a stereo system, Louis called eight appliance stores and asked for the cost of a specific model. The prices he was quoted are listed below:2. $216 $135 $281 $189 $218 $193 $299 $235Find the standard deviation.A company has 70 employees whose salaries are summarized in the frequency distribution below.5.SalaryNumber of Employees5,00110,000810,00115,0001215,00120,0002020,00125,0001725,00130,00013a.b.Find the standard deviation.Find the variance.6. Calculate the mean and variance of the data. Show and explainyour steps. Round to the nearest tenth.14, 16, 7, 9, 11, 13, 8, 10Create a frequency distribution table for the number of times anumber was rolled on a die. (It may be helpful to print or write out all ofthe numbers so none are excluded.)7.3, 5, 1, 6, 1, 2, 2, 6, 3, 4, 5, 1, 1, 3, 4, 2, 1, 6,5, 3, 4, 2, 1, 3, 2, 4, 6, 5, 3, 1Answer the following questions using the frequency distributiontable you created in No. 7.a.Which number(s) had the highest frequency?b.How many times did a number of 4 or greater get thrown?c.How many times was an odd number thrown?d.How many times did a number greater than or equal to 2 andless than or equal to 5 get thrown?9.The wait times (in seconds) for fast food service at two burgercompanies were recorded for quality assurance. Using the data below,find the following for each sample.a.Rangeb.Standard deviationc.Variance8.Lastly, compare the two sets of results.CompanyWait times in secondsBig Burger Company1056778 120 175 115 120The Cheesy Burger133 124 2005979 101 147 118 125What does it mean if a graph is normally distributed? Whatpercent of values fall within 1, 2, and 3, standard deviations from themean?10.


Paper#61540 | Written in 18-Jul-2015

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