The following are 10 employee salaries from a company of 500 employees. Calculate the variance of the salaries. $40,000 $60,000 $70,000 $50,000 $75,000 $100,000 $28,000 $65,000 $85,000 $64,500

A sales manager collected the following data on annual sales and years of experience. Annual Sales ($1000s) 80 Salesperson Years of Experience 1 1 4 102 3 6 103 4 10 119 5 13 136

The table below shows the share of income going to each quintile of the income distribution for Neverland in 1980 and 1990. Complete the table below finding the the cumulative share of income for 1980 and 1990 and answer the following: Share of income in Cumulative share of Share of income in Cumulative share of Quintiles 1980 income in 1980 1990 income in 1990 1st 7% 6.6.% 2nd 11.5% 11.5% 3rd 17% 16.3% 4th 24.8% 22.7% 5th 39.7% 42.9% a) Sketch the Perfect Equality line and the Lorenz curve for 1980 and for 1990. Don't forget to label your graph and your curves! b) According to the Lorenz curves that you draw in (a), which year had worse income inequality, 1980 or 1990? JUSTIFY your answer! NOTE: This is a file upload question. Work your answer in a piece of paper, take a picture and upload your file.

The manager of Hudson Auto Repair would like to get a better picture of the distribution of costs for new parts used in the engine tune-up jobs done in the garage. A sample of 50 customer invoices for tune-ups has been taken and the costs of parts, rounded to the nearest dollar, are listed below. 91 78 93 57 75 52 99 80 73 62 71 69 72 89 66 75 79 75 72 76 104 74 62 68 97 105 77 65 80 109 85 97 88 68 83 68 71 69 67 74 62 82 98 101 79 105 79 69 62 73 Develop a frequency distribution for these cost data. Use your own judgment to determine the number of classes and class width that provide a distribution that will be meaningful and helpful to the manager. a. Develop a stem-and-leaf display showing both the rank order and shape of the data set. (3) b. Develop a stretched stem-and-leaf display using two stems for each leading digit(s). (2) c. Which display is better at revealing the natural grouping and variation in the data? (1)

The wages of employees of a small accounting firm are as follows. Draw a bar graph that represents the distribution. $60,000 $14,000 $25,000 $25,000 $16,000 $30,000 $18,000 $20,000 $25,000 $30,000 $18,000 $35,000 $50,000

The following are (fictional) McDonald's service times (in seconds) for a random sample of drive-thru customers.  98  117  45  103  75  65  129  93  109  84  56  118 Calculate the median