show calculations (Forecasting Error Metrics)

Jack and Jill are forecasters working at ABC Inc. Given in the tables below are their forecasts. Who is the better forecaster - Jack or Jill? Justify with appropriate calculations. \begin{tabular}{|c|c|} \hline \multicolumn{2}{|c|}{ JILL } \\ \hline ActualDemand & Forecast \\ \hline 1400 & 1520 \\ \hline 1625 & 1725 \\ \hline 1685 & 1550 \\ \hline 1550 & 1750 \\ \hline \end{tabular}