Patent Document ID: 4048484
Application ID: 05680223
Patent Flag: 1

Claim One:
1. A digital calculator apparatus for use by teachers for averaging a sequence of grades in a particular letter grading system, each grade of the system having a preassigned numerical weight, said apparatus comprising: a keyboard having a plurality of manually operable grade keys, each key bearing as a label a particular letter grade in said particular system; digital display means including a series of discrete signal display units, said display means having a letter grade section, a numerical weight display section and a number of inputs section; means for activating said display means such that when a particular grade key is actuated the particular grade of that key is displayed on said letter grade display section, the numerical weight assigned that particular grade is displayed on said numerical weight display section and the cumulative number of grade keys which have been actuated in that particular sequence is displayed on said number of inputs section; means for summing the numerical weights of all the particular grade keys which have been actuated in a particular sequence; means for dividing said sum of numerical weights by said cumulative number to arrive at an average numerical weight; and means for decoding said average numerical weight to deterine its letter grade equivalent and for displaying said letter grade equivalent on said letter grade display section.