What proportion of these batteries can be expected to have lives of 322 hours or less? Assume a normal d?
Daisy asked:
Battery Power Problem. A certain type of thermal battery
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Battery Power Problem. 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.
October 26th, 2009 at 4:00 pm
z-value = (322-300)/15 = +1.67 to 2 DP
looking up the left tail for this z-value,
proportion = 92.9% M3