% of batteries that has life span that is more than 2065 hr
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The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 30 hours. What percent of batteries have a life span that is more than 2065 hours?
1. 3%
2. 2.6%
3. 1%
4. 1.5%
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Using the z formula:
z = (x-mean)/standard deviation
Given mean= ...
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