$2.$ The following table presents data collected in the last household O $-$ D survey $($made ten years ago$)$ for three particular zones:

Ten years ago two household$-$based trip generation models were estimated using this data. The first was a linear regression model given by:

$\backslash [$

y$=0\mathrm{.}2+0\mathrm{.}5\backslash$mathrm$\{$x$\}\_\{1\}+1\mathrm{.}1\backslash$mathrm$\{$Z$\}\_\{1\}\backslash$quad $\backslash$mathrm$\{$R$\}^\{2\}=0\mathrm{.}78$

$\backslash ]$

where $\backslash ($ y $\backslash )$ are household peak hour trips, $\backslash (\backslash$mathrm$\{$x$\}\_\{1\}\backslash )$ is the number of workers in the household and $\backslash ($ Z$\_\{1\}\backslash )$ is a dummy variable which takes the value of $1$ for high income $(\backslash (>70000\backslash ))$ households and $0$ in other cases.

The second was a category analysis model based on two income strata $($low and high income$)$ and two levels of family structure $(1$ or less and $2$ or more workers per household$).$ The estimated trip rates are given in the following table:

If the total number of trips generated today during the peak hour by the three zones are given by: