Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of 47 hours. 1. What would be the z-score of a light which lasts 293 hours? 2. If a light bulb had a z-score of 2.50, how many hours did it last? 3. What percentage of all light bulbs last less than 276 hours? 4. What percentage of all light bulbs last longer than 343 hours? 5. What percentage of all light bulbs last between 290 and 330 hours? 6. Suppose the company wanted to throw away all light bulbs that were in the lowest 5%. How long would a light bulb need to last in order to be thrown away? (Round to the nearest tenth of an hour.)

Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of 47 hours. 1. What would be the z-score of a light which lasts 293 hours? 2. If a light bulb had a z-score of 2.50, how many hours did it last? 3. What percentage of all light bulbs last less than 276 hours? 4. What percentage of all light bulbs last longer than 343 hours? 5. What percentage of all light bulbs last between 290 and 330 hours? 6. Suppose the company wanted to throw away all light bulbs that were in the lowest 5%. How long would a light bulb need to last in order to be thrown away? (Round to the nearest tenth of an hour.)

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.

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Solve 4, 5, and 6 please

Suppose that a company makes light bulbs with a mean life
of 310 hours, and a standard deviation of 47 hours.
1. What would be the z-score of a light which lasts 293 hours?
2. If a light bulb had a z-score of 2.50, how many hours did it last?
3. What percentage of all light bulbs last less than 276 hours?
4. What percentage of all light bulbs last longer than 343 hours?
5. What percentage of all light bulbs last between 290 and 330 hours?
6. Suppose the company wanted to throw away all light bulbs that were in the lowest
5%. How long would a light bulb need to last in order to be thrown away?
(Round to the nearest tenth of an hour.)

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