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A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Question
For part b, how was the answer 2.5 years derived from this equation?
![The probability P, as a percent, that a certain computer keyboard in a public library will last more than t years can be approximated by P = 100e-1.2t
(a) What is the probability that the keyboard will last more than 3 years? Round to the nearest tenth.
2.7
2.7 %
(b) After how many years will the probability of keyboard failure be 95%? Round to the nearest tenth.
X
2.5 yr](https://content.bartleby.com/qna-images/question/03975083-7239-4147-a73f-1117c1b9cafd/34150561-5b71-4a87-9956-119f8b5e407b/prafml_thumbnail.png)
Transcribed Image Text:The probability P, as a percent, that a certain computer keyboard in a public library will last more than t years can be approximated by P = 100e-1.2t
(a) What is the probability that the keyboard will last more than 3 years? Round to the nearest tenth.
2.7
2.7 %
(b) After how many years will the probability of keyboard failure be 95%? Round to the nearest tenth.
X
2.5 yr
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