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Normal probability distribution table11/3/2023 The curve centre is determined by the mean. Every normal distribution is a stretched or squeezed variant of the standard normal distribution that has been moved horizontally right or left. In a typical normal distribution, the mean and standard deviation are always fixed. Whereas the normal distribution on the other hand can have any mean and standard deviation. The standard normal distribution is unimodal and symmetrically distributed with a bell-shaped curve. Normal Distribution VS Standard Normal Distribution Read More: Mean and Variance of Random Variable The following formula can be used to convert any normal random variable X into a z score: The random variable of a standard normal curve is referred to as the standard score or a Z-score. Standard Normal Distribution is a kind of normal distribution that appears when a normal random variable has a mean value equals to zero and the value of standard deviation equals one.
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