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Using the standard normal table, the probability that seth’s light bulb will last no more than 14,500 (p(z ≤ 1. 25)) hours is about.
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Using the standard normal table, the probability that seth’s light bulb will last no more than 14,500 (p(z ≤ 1. 25)) hours is about.

User Goddchen
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How many standard deviations above the mean is 14,500 hours 1.25 1.5 2.5 using the standard normal table the probability that Seth’s light bulb will last no more than 24,500 (P(z<1.25)) hours is about 89%.
User Seth Holladay
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