Assume that the readings on the thermometers are normally distributed with a mean of 0C and a

Question:

Assume that the readings on the thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A thermometer is randomly selected and tested. In each case, draw a sketch, and find the temperature reading corresponding to the given information.
Find P90, the 90th percentile. This is the temperature reading separating the bottom 90% from the top 10%.