The total area under the curve of the probability density function of any normal distribution is always 1.0.

Name: The total area under the curve of the probability density function of any normal distribution is always 1.0.
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Quizplus · Accepted Answer

This is a well-known fact about the normal distribution. The area under the curve represents the probability of observing any particular value, and since there is a 100% chance of observing some value, the total area under the curve must be 1.0.

The Total Area Under the Curve of the Probability Density