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Our department seminar room is lit by 7 light bulbs, controlled by a single switch. A minimum of 3 lights are needed for
Posted: Tue Apr 26, 2022 6:24 pm
by answerhappygod
- Our Department Seminar Room Is Lit By 7 Light Bulbs Controlled By A Single Switch A Minimum Of 3 Lights Are Needed For 1 (17.32 KiB) Viewed 22 times
Our department seminar room is lit by 7 light bulbs, controlled by a single switch. A minimum of 3 lights are needed for the room to be usable. Suppose the lifetime of the brand of light bulbs fitted is exponentially distributed with a mean of 400 hours. Assume a seminar lasts exactly 1 hour, and that the lights are switched on only during the seminar. What is the probability that after 500 seminars, exactly 3 bulbs do not need to be replaced? You may need to use a calculator Give your answer rounded to 4 decimal places.