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hi MathNewbie22, On the graph move the sllder until you get this z value and there's the probability. In an exam they won't let you carry a computer in and go online, so how do you do the question then? Look below the graph and you'll find a table of probabilities for given z values. This table starts at the half way value of z = 0 and goes up to a z value of 3.09. It saves space by not giving the other half of the table, which would be the same by symmetry. So you look for your z value, read off the probability, and add 0.5 for the missing half of the table. Bob
A set of final exam marks in a stats course is normally distributed, with a mean of 73 and a standard deviation of 9. 