Digital grade averager

Details Digital grade averager Digital grade averager

1977-02-07

1978-10-03

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 1502, G06F 1520

Patent

active

041187830

ABSTRACT:
The apparatus is a calculator for use by teachers which adds letter grades, accompanied, if desired, by plus or minus signs, averages those grades in terms of their numerical equivalents and displays the average grade and also the number of grades averaged. Letter grades are entered from a key board as binary coded digits. Plus and minus signs are assigned a decimal fraction value and are also entered in binary code. The grades so entered are added in a binary coded decimal counter, the outputs of which are returned to the calculator as a divisor and are also passed to binary decoders which drive conventional digital entry display elements. The average grade is displayed by conventional calculator display elements.

REFERENCES:
patent: 3470368 (1969-09-01), Brittan
patent: 3783257 (1974-01-01), Friedman et al.
patent: 4048484 (1977-09-01), Brittan

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