A certain type of device has an advertised failure rate of 0.008 per hour. The failure rate is constant and the exponential distribution applies. (a) What is the mean time to failure? (b) What is the probability that 250 hours will pass before a failure is observed? (a) The mean time to failure is hours. (Type an integer or a decimal. Do not round.)

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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I need help with this parts a and b please

A certain type of device has an advertised failure rate of 0.008 per hour. The failure rate is constant and the
exponential distribution applies.
(a) What is the mean time to failure?
(b) What is the probability that 250 hours will pass before a failure is observed?
(a) The mean time to failure is hours.
(Type an integer or a decimal. Do not round.)
Transcribed Image Text:A certain type of device has an advertised failure rate of 0.008 per hour. The failure rate is constant and the exponential distribution applies. (a) What is the mean time to failure? (b) What is the probability that 250 hours will pass before a failure is observed? (a) The mean time to failure is hours. (Type an integer or a decimal. Do not round.)
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