Question

- Thermometer Error. Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0.0°C and a standard deviation of 1.0°C. What readings separates the highest 13% of the thermometers from the rest? (Round answer to two decimal places)

-A company knows that replacement times for the quartz time pieces it produces are Normally distributed with a mean of 12.8 years and a standard deviation of 1.1 years.f the company wants to provide a warranty so that only 0.9% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty?
-What proportion of Z-scores are outside the interval Z = −1.46 and Z = 1.46?

Answer 1