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 2 years? Round to the nearest tenth. % (b) After how many years will the probability of keyboard failure be 79%? Round to the nearest tenth. yr
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 2 years? Round to the nearest tenth. % (b) After how many years will the probability of keyboard failure be 79%? Round to the nearest tenth. yr
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Question
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 2 years? Round to the nearest tenth.
%
(b) After how many years will the probability of keyboard failure be 79%? Round to the nearest tenth.
yr
%
(b) After how many years will the probability of keyboard failure be 79%? Round to the nearest tenth.
yr
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