Consider the following ANOVA table below. Some parts are blank intentionally. The number of observations is $249.$

$\backslash$table$[[$Source$,$SS$,$DF$,$MS$],[\backslash$table$[[$Model$],[($Regression$)]],,,921],[$Residual $($Error$),,,],[$Total$,1,332,,]]$

The MSE is:

Round your answer to two decimal places.