There are often cases in Tanach where the Bnei Yisrael speak/answer simultaneously. Is there a general rule behind what this means or does it change from verse to verse? It would seem difficult to assume that all the nation would say a sentence in synchrony; unless, of course, it is miraculous.
For instance in the blessings and curses (perhaps easier for a whole nation to answer one word simultaneously): וְאָמַר כָּל-הָעָם, אָמֵן. This expression repeats a number of times.
Another example is Bamidbar (11:4): וַיֹּאמְרוּ מִי יַאֲכִלֵנוּ בָּשָׂר. Rashi comments initially that the eirev rav instigated this complaint but the Bnei Yisrael joined in in complaining collectively. I would imagine that this complaint is the 'general feeling' of the nation at the time rather than each person saying in synchrony "who will feed us meat"?
Another example is Yehoshua (24:24): וַיֹּאמְרוּ הָעָם, אֶל-יְהוֹשֻׁעַ: אֶת-יְהוָה אֱלֹהֵינוּ נַעֲבֹד, וּבְקוֹלוֹ נִשְׁמָע. Does this mean that everyone actually said these words or is this a way of documenting the general acceptance of all.