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# Suppose the life of a particular brand of laptop battery is normally distributed with a mean of 8 hours and a standard deviation of 0.6 hour.

Suppose the life of a particular brand of laptop battery is normally distributed with a mean of 8 hours and a standard deviation of 0.6 hour. What is the probability that the battery will last more than 9 hours before running out of power?

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1 comment
• sorry, ans is 0.0478
• ashok592000
• Mar 03, 2016 at 8:13pm

X r.v for lifetime X ~ N(8,0.6^2) mu=8, sigma=0.6 P(X  &gt; 9)  =P(... View the full answer

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