The word dedujo is the preterite form of deducir in the third person singular.
See the full deducir conjugation

deducir

Por ejemplo, ¿cómo dedujo que este hombre es un intelectual?
For example, how do you deduce that the man is intellectual?
Dijo que usted misma dedujo la fórmula para la bomba.
You said you figured out the formula for the bomb yourself.
No me diga que dedujo, lo que está mal con el Sr. Small.
Don't tell me you've deduced what's wrong with Mr. Small.
El LISCR dedujo 1,3 millones de dólares en 2002.
LISCR deducted $1.3 million in 2002.
Alastair me dijo que Banville lo sabe, que lo dedujo.
Alastair told me that Banville knows, that she worked it out.
¿Lo dedujo de una taza de té?
You got it from a cup of tea?
Y dedujo que yo lo dejé allí.
And you quickly deducted that I left it there.
¿Me dice que dedujo todo eso solo de leer mi libro?
Do you mean to say you got all that just from reading my book?
Así, la Embajada dedujo que la información era falsa.
In view of this information, the Embassy concluded that the information was false.
Lo dedujo todo, igual que has hecho tú.
Put it together, same way you did.
No, pero lo dedujo.
No, but he worked it out.
¿Qué dedujo de ello?
What did you deduce from that?
No le dije, lo dedujo.
I didn't tell him, he guessed.
No, solo lo dedujo.
No, he just jumped to the conclusion.
Claro, él lo dedujo.
Sure, he figured it out.
El Doctor lo dedujo.
The Doctor worked it out.
Se dedujo que la narcosis podía ser el mecanismo de toxicidad que afectaba a los embriones.
The mechanism of toxicity to the embryos was suggested to be narcosis.
Esta vez lo dedujo bien.
Well, he figured it okay, this time.
No le dije. Ella sola lo dedujo.
Jake, she figured it out on her own.
Sí, pero yo no se lo dije, ella lo dedujo.
Yeah. She knows, but it wasn't me that told her. She figured it out for herself.
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