Consider the actual and forecast values contained in the table.

# Actual Forecast # Actual Forecast

$11010\mathrm{.}862624\mathrm{.}5$

$21313\mathrm{.}672827\mathrm{.}2$

$31716\mathrm{.}382929\mathrm{.}9$

$4191993232\mathrm{.}6$

$52221\mathrm{.}7103535\mathrm{.}3$

At which observation is the tracking signal at its maximum value?

Group of answer choices

Observation #$5$

Observation #$7$

Observation #$6$

Observation #$4$