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The standard normal distribution is a special case normal distribution, which has a mean of zero and a standard deviation of one.
Standard deviation is a way to describe how the data is distributed around the Arithmatic Mean. It is not a simple formula to calculate, as shown in the links.
The true / real standard deviation ("the mean deviation from the mean so to say") which is present in the population (everyone / everything you want to describe when you draw conclusions)
Standard deviation is a way to describe how the data is distributed around the Arithmatic Mean. It is not a simple formula to calculate, as shown in the links.
'Mean', 'mode', 'median' and 'standard deviation' are all quantities used in statistics. Each one is an attempt to use a single number to describe the essential nature and character of a bunch of numbers.