First, you need to determine the mean.
Then, subtract the mean from every number you have. The SQUARE all your numbers.
Add up all of the resulting squares to get their total sum. Divide by one less then the total numbers you have (if you have 6 numbers you will divde by five)
To get the standard deviation, just take the square root of the resulting number
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You're an idiot. It's standard deviation. Google that for your answer.
You cannot because the median of a distribution is not related to its standard deviation.
The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
It is mean + 2*standard deviation.