# HW 1 - 2 nd Heat pump \$100 90/22 = .4545 2 nd heat pump is...

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Joseph N. Mahoney Week 1 Chapter 7 9. A. 68% of all standard deviations will be under 1 standard deviation. 495 - 505 B. 95% of all standard deviation will be under 2 standard deviations. 490 – 510 C. 99.7% of all standard deviations will be under 3 standard deviations. 485 – 515 11. Rob. Z = X – mean/ standard deviation \$50,000 - \$60,000/ \$5,000 = 2.0 Standard Deviations, Rob is 2 standard deviations below the salary of the typical salary. Rachel \$50,000 – 35,000/ \$8000 = 1.875 , Rachel is 1.875 standard deviations above the typical salary. 12. Repair Heat pump according to Cincinnati Enquirer Mean = \$90 Standard Deviation = \$22 Monte’s Plumbing and Heating: 1 st heat pump \$75 – 90/ 22 = .6818 1 st heat pump is .6818 standard deviations below the mean cost.

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Unformatted text preview: 2 nd Heat pump \$100 90/22 = .4545 2 nd heat pump is .4545 standard deviations above the mean cost. 17. Mean = 50 Standard Deviation = 4. A. 44.0 50/ 4 = 1.5 = .4332 55.0 50/ 4 = 1.25 = .3994 .4332 + .3994 = .8326 B. 55.0-50/4 = 1.25 =.3994 .5000 - .3994 = .1006 are greater than 55.0 C. 52.0 50/ 4 = .5 = .1915 55. 50/ 4 = 1.25 = .3994 .3994 - .1915 = .2079 values lie between 52. And 55. 18. Mean 80.0 Standard Deviation = 14.0 A. 75.0 80.0/ 14.0 =.36 = .1406 90 80/ 14 = .71 =.2611 .1406 + .2611 = .4017 population lie between 75 and 90. B. .5000 - .1406 = .3594 < less than 75. C. 55.0 80.0 / 14.0 = 1.79 = .4633 70.0 80.0/ 14 = .71 = .2611 .4633 + .2611 = .7244...
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## This note was uploaded on 02/03/2011 for the course BUS 205 taught by Professor Boafo during the Spring '11 term at Allen University.

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HW 1 - 2 nd Heat pump \$100 90/22 = .4545 2 nd heat pump is...

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