A chemical plant has an emergency alarm system. When an emergency situation exists, the alarm sounds with probability 0.95; when an emergency situation does not exist, the alarm sounds with probability 0.02. A real emergency situation is a rare event with probability 0.004. Given that the alarm has just sounded, what is the probability an emergency situation exists?
Question 7A
A chemical plant has an emergency alarm system. When an emergency situation exists, the alarm sounds with
a.0.1602
An important part of the customer service responsibility of a telephone company relates to the speed with which problems in residential service can be corrected. Suppose past data indicate that the likelihood is 0.7 that a problem in residential service can be corrected on the same day. Ten problems are reported today.
What is the probability that all 10 problems will be corrected today.
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