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Suppose that a brand of lightbulb lasts on average 2419 hours with a standard deviation of 252 hours. Assume the life of the lightbulb is
Suppose that a brand of lightbulb lasts on average 2419 hours with a standard deviation of 252 hours. Assume the life of the lightbulb is normally distributed. Calculate the probability that a particular bulb will last from 1958 to 3175 hours?
P(1958 <X< 3175) =
Enter your answer as a number accurate to 4 decimal places.
*Note: all z-scores must be rounded to the nearest hundredth.
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