Associates a particulare probability of occurrence with each outcome in the sample space.
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The probability density of the standardized normal distribution is described in the related link. It is the same as a normal distribution, but substituted into the equation is mean = 0 and sigma = 1 which simplifies the formula.
They are probability distributions!
A bell shaped probability distribution curve is NOT necessarily a normal distribution.
probability density distribution
The total area of any probability distribution is 1