Calculate$($a$)$ MAD and$($b$)$ MSE for the following forecast versus actual sales$$ figures:

$$

Forecast

$9999$

$109109$

$119119$

$129129$

Actual

$9494$

$107107$

$116116$

$129129$

Part $2$

$$a$)$

MADequals$=$enter your response here

$($round your response to one decimal$$ place$).$

Part $3$

$$b$)$

MSEequals$=$enter your response here

$($round your response to one decimal$$ place$).$