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.
------------------
Find the z-value of 322
z(322) = (322-300)/15 = 22/15 = 1.46667
===================================
P(x>=322) = P(z<1.4667) = 92.88%
=========================================
Cheers,
Stan H.
Reply to stanbon@comcast.net or algebra.com
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