The life expectancy of a Duracell battery normally distributed with a mean of 30,000 hours and a standard deviation of 5,000 miles. What percentage of batteries will have a life of 24,000 to 36,000 miles?
Added by Julia P.
Step 1
First, we need to find the z-scores for 24,000 and 36,000 hours. The z-score formula is: $z = \frac{x - \mu}{\sigma}$ where $x$ is the value, $\mu$ is the mean, and $\sigma$ is the standard deviation. Show more…
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