Technically, the normal curve has a formula:  This formula results in the following graphs, depending on the mean and standard deviation:  No matter what, the normal curve has a bell-shape and is symmetric about its mean. When a variable X is from a normal distribution, we say this in "stat-speak" by using the following notation:  This says "X follows a Normal distribution with mean of μ and standard deviation of σ." The X and N will always stay the same, but the mean and standard deviation will be replaced by whatever values they are. Next: We also know the approximate areas under the curve for any normal distribution using The Empirical Rule. |
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