computress

Picture a girl, we usually call her a computress, using a desk calculator. Suppose we had given her a sheet of paper containing several columns of numbers and suppose further we had given her a set of written instructions directing her to sum each column of numbers and then to divide each sum by the number of entries in its column so as to find the average of each column, and finally to enter this value below the appropriate column. Notice that the computress in this task performs […]