For "Entweder..oder.." is the rule: this one thing OR that other thing, correct? So a sentence with that connector would require the singular, because in the end only one thing (out of the two) is so to speak "acting", as follows:
Entweder meine Frau oder mein Kind HAT gestern Nacht den Hund geweckt.
Die Lösung für dieses Problem KANN 10 oder 100 sein.
However for "Weder..noch.." is the rule: not this one thing AND not this other thing correct? So it would require the plural, because it's not this thing AND it's not that thing. (At least that's what I read in my book.)
Weder er noch sie KÖNNEN die Frage unserer Lehrerin beantworten.
Weder mein Freund noch mein Lehrer WISSEN, was gerade passiert ist.
Is my conclusion correct? Or do people use the singular for "Weder..noch.." too? (kann), (weiß)