the lifetime of a battery is normally distributed


The lifetime of a battery is normally distributed with a mean life of 40 hours and a standard deviation of 1.2 hours. Find the probability to a z-value of 4.16 in 0.9998 a. A randomly selected battery lasts longer than 42 hours b. A randomly selected battery lasts between 43 and 45 hours

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Operation Management: the lifetime of a battery is normally distributed
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