SOLUTION: A certain type of thermal battery
for an airplane navigation device backup power has a
mean life of 300 hours with a standard deviation of 15
hours. What proportion of these bat
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-> SOLUTION: A certain type of thermal battery
for an airplane navigation device backup power has a
mean life of 300 hours with a standard deviation of 15
hours. What proportion of these bat
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Question 209096: A certain type of thermal battery
for an airplane navigation device backup power has a
mean life of 300 hours with a standard deviation of 15
hours. What proportion of these batteries can be
expected to have lives of 322 hours or less? Assume a normal
distribution of backup power device lives. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A certain type of thermal battery
for an airplane navigation device backup power has a
mean life of 300 hours with a standard deviation of 15
hours. What proportion of these batteries can be
expected to have lives of 322 hours or less? Assume a normal
distribution of backup power device lives.
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Find the z-value of 322
z(322) = (322-300)/15 = 22/15 = 1.46667
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P(x>=322) = P(z<1.4667) = 92.88%
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Cheers,
Stan H.
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