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OpenStudy (anonymous):
The life expectancy of a typical lightbulb is normally distributed with a mean of 2,000 hours and a standard deviation of 27 hours. What is the probability that a lightbulb will last between 1,975 and 2,050 hours?
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OpenStudy (anonymous):
0.17619 0.32381 0.79165 0.96784
OpenStudy (kropot72):
Do you know how to calculate a z-score?
OpenStudy (anonymous):
@cj49
OpenStudy (kropot72):
\[\large z=\frac{X-\mu}{\sigma}\] Now just plug in the given values to find the two values of z-score that are needed.
OpenStudy (kropot72):
@dsdasd Are you there?
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