My 1950 "Your first year of teaching shorthand and transcription" book says (PLEASE NOTE : This book was made when Simplified was out and most were learning for office dictation. )
A minimum recording rate of 60 words a minute on a five-minute test of standard difficulty should be held to as an absolute goal that must be reached before people's can go on to Advanced shorthand and transcription.
It does say that is passing. It goes on to say: --Accurate transcription of the 80 words and minute dictation grade A. --Fairly accurate transcription of the 80 words a minute dictation B or C depending upon the quality. --Accurate transcription of the 60 words a minute dictation grade C. --Fairly accurate transcription of the s60 words a minute dictation grade D --Inaccurate transcription of notes recorded at either speed Grade F
To get the grade A, you have to have no more than five errors. To get the Grade B or C at eighty words a minute, you have to have no more than 5% of errors.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922