Normal Distribution
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A normal distribution is a symmetrical, bell-shaped curve that is unimodal, meaning that it has one peak. The area under a normal distribution is equal to 1.00.
Scenario: Consider the distribution of IQ scores, which is normal and has a mean (µ) of 100 and a standard deviation (σ) of 15.
When we cut the distribution down the middle, it's a mirror of the other side.
It has one peak at an x-value of 100 (since that's the mean (µ) of all IQ scores).
The entire area (in red) under this normal distribution equals 1.00, or 100% of the data points.
