4. Suppose that the lifetime of a laptop has normal distribution with mean (expectation) 10 (in years), and variance o2. What can be the value of o if we know the following: the probability that the laptop's lifetime is at most 11 is 84%?

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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4. Suppose that the lifetime of a laptop has normal distribution with mean (expectation) 10 (in years), and
variance o2. What can be the value of o if we know the following: the probability that the laptop's
lifetime is at most 11 is 84%?
Transcribed Image Text:4. Suppose that the lifetime of a laptop has normal distribution with mean (expectation) 10 (in years), and variance o2. What can be the value of o if we know the following: the probability that the laptop's lifetime is at most 11 is 84%?
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