Based on the given information below

Month...Sales Forecast

$1152$

$2143$

$3\mathrm{.}139$

$4150144\mathrm{.}67$

$5.141144\mathrm{.}00$

$6148143\mathrm{.}33$

Find Cummulative Forecast Error $($CFE$)$

$7\mathrm{.}00$

$-7\mathrm{.}00$

$3\mathrm{.}34$

$-3\mathrm{.}34$

None of the above