A particular forecasting model was used to forecast a six$-$month period. Here are the forecasts and actual demands that resulted:

Month

Forecast

Actual

April

$260$

$210$

May

$335$

$260$

June

$410$

$332$

July

$360$

$310$

August

$385$

$335$

September

$460$

$403$

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What is the tracking signal? $($Round your answer to $1$ decimal place$)$

Question $24$ options:

a$)$

$-1\mathrm{.}0$

b$)$

$-6\mathrm{.}0$

c$)$

$-2\mathrm{.}0$

d$)$

$-5\mathrm{.}0$