Name the distribution of a light bulbs life and specify

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Reference no: EM13633706

We know that the average life of a light bulb is 10,000 hours. There are 12 light bulbs in a classroom. In order for a class to be held in the room, 9 or more light bulbs must be working. Each light bulb works independently of the other light bulbs in a classroom.

A) Name the distribution of a light bulb's life and specify parameters.

B) What is the probability that a single light bulb works for over 10,000 hours?

C) Given a light bulb has already operated for 5,000 hours, what's the probability that it will operate more than 15,000 hours?

D) Given a light bulb operates no more than 15,000 hours, what's the probability that it breaks before 5,000 hours? E)Assuming that all light bulbs in a room were installed at the same time, what is the probability that a class can be held in that room after 10,000 hours of light bulbs' operation?

Reference no: EM13633706

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