The following table shows the actual values and forecast values calculated using a linear trend with seasonality model for a time series of quarterlyprice index:

The following table shows the actual values and forecast values calculated using a linear trend with seasonality model for a time series of quarterly price index: ' ctual value Forecast value 2018, 01 70.6 2018, 02 71.7 2018, 03 76.2 2018, Q4 75.8 2019, 01 79.1 The Mean Absolute Deviation (MAD) for the forecast method is (please round your answer to 2 decimal places)