arithmetic
posted by Susan on .
If you treat the day of the month as a number (March 12th is the number 12, April 4th is the number 4), what is the average value of the numbers that represent the 6 Tuesdays that fall after September 12, 2011

Look up the 6 Tuesday dates on your calendar.
Mean = ∑x/n (Where x = values of dates and n = number of dates.)