The following model is used for forecasting the sales of lollipops (in thousand dollars): \hat{Y}_t=21.141+6.945t+2.716t^2 The model was established using quarterly data starting from quarter index t=1 at Quarter 1, 2013. The correct forecasted trend value for the third quarter of 2019 is Answer Question 4[input] thousand dollars (please round your answer to 2 decimal places).数值题

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