A forecasting model has produced the following forecasts. At the end of March the tracking signal would be $\_\_\_\_\_\_\_\_\_.($Use two decimal places if needed$)$

Period

Demand

Forecast

January

$130$

$120$

February

$110$

$115$

March

$120$

$120$

Question $4$ options:

$1$

$1\mathrm{.}5$

$0\mathrm{.}5$

$2$