Posted by Penny on Saturday, March 16, 2013 at 1:57pm.
During September, the average temperature of Laurel Lake is 64.2º and the standard deviation is 3.2º. Assume the variable is normally distributed. For a randomly selected day, find the probability that the temperature will be
a. Above 62º
b. Below 67º
c. Between 65º and 68º

Statistics  PsyDAG, Saturday, March 16, 2013 at 2:03pm
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores. 
Statistics  Penny, Saturday, March 16, 2013 at 4:44pm
a. .2451
b. .8051
c. .3897