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Unformatted text preview: z(29) = (2932)/2 = 1.5 z(34) = (3432)/2 = 1 a. What percent of the garages take between32 hours and 34 hours to erect? using a z table (http://davidmlane.com/hyperstat/z_table.html): p(0 < z < 1) = 0.3413 = 34.13% b. What percent of the garages take between 29 hours and 34 hours to erect? using the z table again: p(1.5 < z < 1) = 0.7745 = 77.45% c. What percent of the garages take 28.7 hours or less to erect? Get the z value: z = (28.732)/2 = 1.65 using the table: p(z < 1.65) = 0.0495 = 4.95% d. Of the garages, 5 percent take how many hours or more to erect? From the table, the z value we need is: 1.6449 Solve for x: 1.6449 = (x32)/2 Multiply by 2: 2*1.6449 = (x32) Add 32: x = 2*1.6449 + 32 x = 35.2898 hours...
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 Spring '11
 Emil
 Statistics, Counting, Normal Distribution, Standard Deviation, 2 hours, Garages, 4.95%, Weston Materials, Inc.

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