A commercial bleach eventually becomes ineffective because
Chapter 4, Problem 4.8.2(choose chapter or problem)
A commercial bleach eventually becomes ineffective because the chlorine in it becomes attached to other molecules. The company that manufactures the bleach estimates that the median time for this to happen is about one and a half years. (a) If an exponential distribution is used to model the time taken for a sample of bleach to become ineffective, what is a suitable value for the parameter ? (b) Estimate the probability that a sample of bleach is still effective after 2 years, and the probability that a sample of bleach becomes ineffective within 1 year.
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