I am stumped on this problem can someone please explain? A certain type of thermal battery for an airplane?
Rebecca J asked:
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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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.
August 19th, 2009 at 7:54 pm
There is no way of determining the lifetime of a battery of a cell. These are all subjected to highly variable operating conditions. the parameters are so Diverse that why bother. Some will last and some will fail . I do know that some batteries last a very long time, and others fail almost from the start.