Compute MSE using the average of all the data available as the forecast for the next period. In this way of forecasting, the forecast for any time period is the same as the average of all data in the past up until right before that point in time. Therefore, instead of part of past data being relevant as in the moving average method, all past data is assumed to be relevant. $($Round your answer to two decimal places.$)$

MSE $=$

What is the forecast for month $8?($Round your answer to two decimal places.$)$