Calculate the missing values.

For the next six month period Sammy wants to calculate the monthly deviation from the average.

Month Sales Average Deviation
July $1,750 1,460.83
Aug. $1,800 1,460.83
Sept. $1,625 1,460.83
Oct. $1,395 1,460.83 -65.83
Nov. $1, 215 1,460.83
Dec. $ 980 1,460.83