Table $8\mathrm{.}9$

Consider the following results from the last ten periods of student enrollment forecast by the Operations Management department chairman.

Period Forecast Actual

$12526$

$23231$

$34245$

$45350$

$56470$

$67072$

$78178$

$88890$

$99593$

$10102105$

Use Table $8\mathrm{.}9$ to determine the MAD for period $5$ for the department chairman's forecast.

$2\mathrm{.}0$

$2\mathrm{.}8$

$2\mathrm{.}42$

$2\mathrm{.}67$