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In the light bulb industry, the Average Rated Life (ARL) refers to the lifespan of a bulb. A certain light bulb is tested and has a mean ARL of 1,250 hours and a standard deviation of 125 hours. The shape of the distribution is approximately normal. What would we expect the lifespan to be for 99.7% of this light bulb? For this light bulb, we would expect 99.7% of bulbs to last between hours. hours and 875 1000 1125 1250 1375 1500 1625
Sagot :
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