Question

Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69 degrees C is ____

Answer 1

P(-1.39<=Z<=1.69) = 0.8722

You can play around with Z table stuff at

http://davidmlane.com/hyperstat/z_table.html