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standard deviation is the correctiness of reliability of the mean
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)
The displacement, from the vertical, of a child on a swing, or a pendulum.
I am sorry to say that Hobbits do not exist in the real world. So Hobbits cannot be mean in real life since they are not in real life.
A standard normal distribution has a mean of zero and a standard deviation of 1. A normal distribution can have any real number as a mean and the standard deviation must be greater than zero.