The lifetime of a small electric motor can be modeled as a random variable with the following
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Question:
The lifetime of a small electric motor can be modeled as a random variable with the following probability distribution table.
Lifetime | Probability |
---|---|
1 year | 0.6 |
2 years | 0.2 |
3 years | 0.1 |
4 years | 0.1 |
Suppose we randomly select 25 motors and run them to see how long they last. Suppose the average lifetime, X, of these randomly selected motors is 3.5 years. Find the z-score of this observation.
Related Book For
Basic Technical Mathematics
ISBN: 9780137529896
12th Edition
Authors: Allyn J. Washington, Richard Evans
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