A manufacturer claims that life spans for their copy machines (in months) can be described by a Normal model N(42, 7). The manufacturer wants to reduce the 36-month failure rate (those at 36 or below) to only 10%. Assuming the mean lifespan will stay the same, what NEW standard deviation must they achieve?
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A manufacturer claims that life spans for their copy machines (in months) can be described by a Normal model N(42, 7). The manufacturer wants to reduce the 36-month failure rate (those at 36 or below) to only 10%. Assuming the mean lifespan will stay the same, what NEW standard deviation must they achieve?
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