if angellous said so then its pretty close, I have found close to the same ratio.
remember you would have one person reading these tales to groups of people for entertainment and religious purpose to spread the word.
Oral tradition is said to be very accurate at that time as they had allot of practice.
much of the OT was told for hundreds of years before being written down.
The NT was told for decades orally before unknown authors wrote the early books down
Look at this......
John 19:19-20 (New American Standard Bible)
19Pilate also wrote an inscription and put it on the cross. It was written, "JESUS THE NAZARENE, THE KING OF THE JEWS." 20Therefore many of the Jews read this inscription, for the place where Jesus was crucified was near the city; and it was written in Hebrew, Latin and in Greek
It says many of the Jews read this inscription. Means they could read.
Now I'll agree that Jesus' disciples may have been illiterate.
BigRed