The Standard Normal Distribution

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. Find the probability of obtaining a reading less than 1.9°C.

P(Z<1.9)=

Answer 1

Looking up the Z value of 1.9 in a Z-score table shows .9713.

This means the probability is .9713 or 97.13%.