Mathematics, 14.04.2020 19:39 liapis2002

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The mean lifespan of a light bulb manufactured by a company is 400 days with a standard deviation of 65 days. Assuming that bulb lifespan is a normally distributed random variable, what is the probability that a light bulb manufactured by this company will last at most 270 days?

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PLEASE ANSWER The mean lifespan of a light bulb manufactured by a company is 400 days with a standard deviation of 65 days. Assuming that bulb lifespan is a normally distributed random variable, what is the probability that a light bulb manufactured by this company will last at most 270 days?

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PLEASE ANSWER
The mean lifespan of a light bulb manufactured by a company is 400 days with a standard deviation of 65 days. Assuming that bulb lifespan is a normally distributed random variable, what is the probability that a light bulb manufactured by this company will last at most 270 days?