30p question

calculate the missing values.

for the six month period given, fred wants to calculate the monthly deviation from the average.

month sales average deviation
july $1,250 1,412.50 -162.50
aug. $1,700 1,412.50 ( )
sept. $1,125 1,412.50 ( )
oct. $1,850 1,412.50 ( )
nov. $1,500 1,412.50 ( )
dec. $1,050 1,412.50 ( )