A manufacturer of personal computers sets tests competing brands and finds that the amounts of energy they require are normally distributed with a mean of 285 kwh and a standard deviation of 9.1 kwh. If the lowest 25% and the highest 30% are not included in a second round of tests,what are the upper and lower limits for the energy amounts of the remaining sets?
A)[269.76 300.24]
B)[269.76 289.78]
C)[280.22 289.78]
D)[280.22 300.24]

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Quizplus · Accepted Answer

The Answer of A manufacturer of personal computers sets tests competing brands and finds that the amounts of energy they require are normally distributed with a mean of 285 kwh and a standard deviation of 9.1 kwh. If the lowest 25% and the highest 30% are not included in a second round of tests,what are the upper and lower limits for the energy amounts of the remaining sets?
A)[269.76 300.24]
B)[269.76 289.78]
C)[280.22 289.78]
D)[280.22 300.24]

A Manufacturer of Personal Computers Sets Tests Competing Brands and Finds