z-scores are distributed according to the standard normal distribution. That is, with the parameters: mean 0 and variance 1.
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Normal distribution is a perfectly symmetrical bell-shaped normal distribution. The bell curve is used to find the median, mean and mode of a function.
The standard normal distribution is a normal distribution with mean 0 and variance 1.
le standard normal distribution is a normal distribution who has mean 0 and variance 1
When its probability distribution the standard normal distribution.
The Normal distribution is, by definition, symmetric. There is no other kind of Normal distribution, so the adjective is not used.