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Assume the lifetimes of a certain light bulb are normally distributed with a mean of 10 months and a standard deviation of 2 months. W

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Assume the lifetimes of a certain light bulb are normally distributed with a mean of 10 months and a standard deviation of 2 months. W is the probability that the lifetime of a given light bulb is between 6 and 9 months? Answer is not given in the choices 0.0190 0.7882 20548 2857

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