You have joined GoodMonth tire in Virginia. Your job is a reliability engineer. New tires are being developed for electric cars. Given electric car weight, tire wear is different. You have established a test on the miles dolivered per tire under electric car conditions. The distribution of falure wil be assumed to be exponential. We will RM- The results of your 60,000 mile test are below. Number failed Miles Driven Tire Miles 10,000 12,000 20,000 25,000 360,000 10,000 12,000 20,000 1 25,000 60,000 Total hours 427,000 Irving

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
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Chapter1: Making Economics Decisions
Section: Chapter Questions
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A2
You have joined GoodMonth tire in Virginia. Your job is a reliability enginoer. New tires are being developed for electric cars.
Given electrike car weight, tire wear is different. You have established a tast on the
miles dolivered per tire under electric car conditions. The distribution of failure wil be assumed to be exponential. We will R)-
The results of your 60,000 mila test are below.
Number failed Miles Driven
Tire Miles
10,000
12,000
10.000
12,000
20,000
20,000
25,000
360,000
25,000
60,000
Total hours
427,000
Answer the folawing
How many tires wore tested?
(no decimal)
How many tiros failed?
(no decimal)
What was the lambda ? (Answer to TWO SIGNIFICANT DIGITS. Note: This is not decirrals. This is signiticant digits.)
What is MTTF?
(no decimal
What is the probability of a tire not failing in 50,000 miles?
(wo decimets)
What is the probability of a car with 4 tires traveling 50,000 miles without any tire lailing?
(wo decimals)
Vhat is the probability of a car with 4 tires traveling 50,000 miles experiencing a tire faikure in that 50,000 milos?
(two decimals)
Transcribed Image Text:You have joined GoodMonth tire in Virginia. Your job is a reliability enginoer. New tires are being developed for electric cars. Given electrike car weight, tire wear is different. You have established a tast on the miles dolivered per tire under electric car conditions. The distribution of failure wil be assumed to be exponential. We will R)- The results of your 60,000 mila test are below. Number failed Miles Driven Tire Miles 10,000 12,000 10.000 12,000 20,000 20,000 25,000 360,000 25,000 60,000 Total hours 427,000 Answer the folawing How many tires wore tested? (no decimal) How many tiros failed? (no decimal) What was the lambda ? (Answer to TWO SIGNIFICANT DIGITS. Note: This is not decirrals. This is signiticant digits.) What is MTTF? (no decimal What is the probability of a tire not failing in 50,000 miles? (wo decimets) What is the probability of a car with 4 tires traveling 50,000 miles without any tire lailing? (wo decimals) Vhat is the probability of a car with 4 tires traveling 50,000 miles experiencing a tire faikure in that 50,000 milos? (two decimals)
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