b) The life expectancy of the radioactive isotopes is exponentially distributed with a mean 3 years. i) What is the probability that the radioactive elements will last at least 15 years? ii) If the radioactive isotopes already lasted for 5-years, what is the probability it will be lasted after an additional 20 years?

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.CR: Chapter 13 Review
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b) The life expectancy of the radioactive isotopes is exponentially distributed
with a mean 3 years.
i)
What is the probability that the radioactive elements will last at least
15 years?
ii)
If the radioactive isotopes already lasted for 5-years, what is the
probability it will be lasted after an additional 20 years?
Transcribed Image Text:b) The life expectancy of the radioactive isotopes is exponentially distributed with a mean 3 years. i) What is the probability that the radioactive elements will last at least 15 years? ii) If the radioactive isotopes already lasted for 5-years, what is the probability it will be lasted after an additional 20 years?
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