Assume that the readings at freezing on a batch of thermometers are normally dis

Question

Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. If 2.1% of the thermometers are rejected because they have readings that are too high and another 2.1% are rejected because they have readings that are too low, find the two readings that are cutoff values separating the rejected thermometers from the others.

interval of acceptable thermometer readings =_____________ °C

HOW WOULD YOU DO THIS ON EXCEL

Explanation / Answer

Lower cutoff = -2.03             using excel function =NORMSINV(0.021)

Upper cutoff=2.03         using excel function =NORMSINV(1-0.021)

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