The range is the largest value minus the smallest value.
The mean is the sum of all the values divided by the number of values.
To calculate the variance, subtract each data value from the mean and square the result. Once you have a squared difference from the mean for each data value, add up all of these squared differences. Then, since this is sample data, divide that sum by the number of data values minus 1. (Just divide by the number of data values if you are looking for a population variance).
The standard deviation is the positive square root of the variance.
You can do your own arithmetic.
John
My calculator said it, I believe it, that settles it
