The sum is 510892 34. Calculate the deviation from the mean by subtracting each value from the mean you found in Step 1. E margin of error.
The amount of bias in the sample standard deviation just depends on the kind of data in the data set.
Next divide the sum by however many numbers you added. So under the assumptions of the mean model the point forecast for X for all future time periods should be 9635. X x i n Where x Sample Mean x i x values n Number of Samples. The method of calculation of both the means are same ie.