the lifetimes of a particular cellphone battery are normally distributed with a mean of 1,000 hours and a standard deviation of 150 hours. Find the probability that a battery will fail in less than 970 hours (left tail of the curve)
Added by Bradley S.
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Plugging in the values: \[ z = \frac{970 - 1000}{150} = -0.2 \] Show more…
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