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This distribution has the property that the total area between the curve and the x-axis is 1, very similarly to probability histogramswhere the total of all the bars is exactly 1. It may help to picture many small-width bars on the above graph. Since the total area under the curve is 1, the unit normal distribution measures probability. Other normal distributions are transformed in ways that preserve this total area, so that they are useful in answering questions about probability.
The equation on the right gives a normal distribution with mean μ (Greek letter mu) and standard deviation σ. You do not need to memorize these formulas or where they come from.
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