Yes.
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It depends on the parameter - the mean of the distribution.
Yes, it is true; and the 2 quantities that describe a normal distribution are mean and standard deviation.
Because the area under the curve is a probability and probabilities range from 0.00 to 1.00 or could also be written as 0% to 100%
The sum of proportions computed from a frequency distribution must equal
They are all equal . . . they are the same.(In an asymmetric distribution they are not equal.)