Problem $18-28($Algo$)$

The following are historical demand data:

YEAR SEASON ACTUAL

DEMAND

$2011$ Spring $205$

Summer $146$

Fall $372$

Winter $564$

$2012$ Spring $472$

Summer $270$

Fall $688$

Winter $956$

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.$)$