Sales for boxes of Girl Scout cookies over a 4-month period were forecasted as follows: 100, 120, 115, and 123. The actual results over the 4-month period were as follows: 110, 114, 119, 115. What was the MSE of the 4-month forecasts?

Select one:

a. 28.00b. 54.00c. 7.00d. 216.00e. 108.00