st deviation is a measure of how spread out your data or distribution is.
It's the square root of the variance and the smaller these are the more concentrated your values will be.
I wonder if someone can help me understand Standard Deviation? All explanations I can find show a calculation, and then a result at the end of it.
For instance, on example I have seen is 100 coin flips will have a standard deviation of "5". But what does a standard deviation of "5" mean, or represent?
means "expectation" or mean... You know, average.
Like whats the mean of
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Think of as the probability that occurs. Right cause we have possible numbers and out of the are s. Follow?
Now let be a random variable that takes on one of the values, So with probability with probability
We define expectation it the theoretical sense as
possible value that can take on probability of this value possible value that can take on probability of this value + ...