I often add “I believe” to sentences to clarify that I am not certain.
“Did you feed the dog?” “Yes”
and
“Did you feed the dog?” “I believe so”
have different meanings to me. I parse the first as “I am highly confident that I fed the dog” and the second as “I am unable to remember for sure whether I fed the dog, but I am >50% confident I did so.”
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How much you think your opinion will turn out to coincide with mine - hard to define. If your respective answers are 10, 40, 90, how much did we agree? I’ll guess that the sum of the three differences between my answers and yours is around sixty percentage points [out of 300 possible].