Problem $18-28($Algo$)$

The following are historical demand data:

YEAR SEASON ACTUAL

DEMAND

$2011$ Spring $205$

Summer $142$

Fall $371$

Winter $580$

$2012$ Spring $470$

Summer $281$

Fall $692$

Winter $958$

Use regression analysis on deseasonalized demand to forecast demand in summer $2013.($Do not round intermediate calculations. Round your answer to the nearest whole number.$)$