How widely spread out, or tightly concentrated about the mean it is.
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The standard deviation in a standard normal distribution is 1.
The standard deviation in a standard normal distribution is 1.
The statement is probably: The mean and standard deviation of a distribution are 55 and 4.33 respectively.
It depends on what the distribution is. In a Normal or Gaussian distribution, the standard deviation is the square root of the mean, so it could be 3.1 but, again, it depends on the distribution.
No.