You are given the mean and standard deviation of a normal distribution, and asked what proportion of the distribution lies between values X1 and X2. Use this set of formulas and tables to do the calculation, using formula 2 and the table of the standard normal distribution.

Enter your calculation in the box below, then click on "Submit Calculation" to check it, and click on "Start Again" to get a new version of the same problem.

**Note:**
Do this several times, and make sure you get at least one problem with both values above the mean, one problem with one on either side of the mean, and one with both below the mean.