A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. What lifetime should the manufacturer advertise for these batteries in order that only 2 of the lamps will wear out before the advertised lifetime?
Question 2
A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. What proportion of these batteries will last between 3,800 and 4,100 hours?
Ranges of normal temperature values
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Weak valve springs will produce a normal reading at idle, but as engine speed increases, the needle ...
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