Lifetime for a certain brand of incandescent

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The lifetime for a certain brand of incandescent light bulbs is normally distributed with a mean lifetime of 480 hours and standard deviation of 40 hours. Find a lifetime for this brand of incandescent light bulbs at which the probability is 0.9505 that a randomly selected incandescent light bulb of this brand will last at least that long.

Reference no: EM131870216

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