Finding the probability that the temperature is between x and y Hello I have a problem that I can't seem to come to the proper conclusion with. It is as follows:
What is the probability that a randomly selected day in August will have a temperature greater than 85 but less than 100. Mean is 80 with a std dev of 8 assuming temperature is distributed normally. 
I missed this on a test and I'd like to know where I went wrong so if someone could work it out step by step I would appreciate it very much. Thanks

If you believe the distribution is normal (which it is not) you are asking for the probability that you are between 0.625 standard deviations and 2.5 standard deviations above the mean.  You should have a table of the cumulative error function that will give you the answer.  (For the Wikipedia table you will have to interpolate between 0.62 and 0.63)
