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USE THE INFORMATION BELOW TO ANS In recent years home lighting technology has development of Light Emitting Diode (LED) mainly in traffic lights and although LED bulb

USE THE INFORMATION BELOW TO ANS In recent years home lighting technology has development of Light Emitting Diode (LED) mainly in traffic lights and although LED bulb

MATLAB: An Introduction with Applications
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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USE THE INFORMATION BELOW TO ANSWER QUESTIONS 22 THRU 23 In recent years home lighting technology has changed dramatically due to the development of Light Emitting Diode (LED) bulbs. Although previously used mainly in traffic lights and although LED bulbs are more expensive than incandescent bulbs, they use approximately 90% less energy and they last up to 25 times longer than incandescent bulbs. It has been estimated that the average home saves $250 per year using LED bulbs rather than incandescent bulbs. One popular manufacturer of LED bulbs claim that nearly all of their 75- watt LEDs will last for more than 25,000 hours. Suppose that a small company purchases 400 of these 75-watt LEDs with a guarantee that 99% of them will last for more than 25,000 hours. Assuming the guarantee is correct, what is the probability that at least 390 of them will last for more than 25,000 hours? O 0.9626 9973 0.9805 0.9751 Suppose that a small company purchases 350 of these 75-watt LEDs with a guarantee that 98% of them will last for more than 25,000 hours. Assuming the guarantee is correct, what is the expected number of them that will last for more than 25,000 hours? O345 343 340 336
Transcribed Image Text:USE THE INFORMATION BELOW TO ANSWER QUESTIONS 22 THRU 23 In recent years home lighting technology has changed dramatically due to the development of Light Emitting Diode (LED) bulbs. Although previously used mainly in traffic lights and although LED bulbs are more expensive than incandescent bulbs, they use approximately 90% less energy and they last up to 25 times longer than incandescent bulbs. It has been estimated that the average home saves $250 per year using LED bulbs rather than incandescent bulbs. One popular manufacturer of LED bulbs claim that nearly all of their 75- watt LEDs will last for more than 25,000 hours. Suppose that a small company purchases 400 of these 75-watt LEDs with a guarantee that 99% of them will last for more than 25,000 hours. Assuming the guarantee is correct, what is the probability that at least 390 of them will last for more than 25,000 hours? O 0.9626 9973 0.9805 0.9751 Suppose that a small company purchases 350 of these 75-watt LEDs with a guarantee that 98% of them will last for more than 25,000 hours. Assuming the guarantee is correct, what is the expected number of them that will last for more than 25,000 hours? O345 343 340 336
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