The following are historical demand data:

YEAR SEASON ACTUAL

DEMAND

$2011$ Spring $201$

Summer $148$

Fall $378$

Winter $562$

$2012$ Spring $473$

Summer $269$

Fall $678$

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.$)$