There is no particular reason. There are times when a table is more useful and others where a tree diagram is better. If the probability of an event changes according to the outcome of an earlier event (for example picking cards without replacing) then a table will be close to useless whereas a tree diagram is perfectly suited.
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the meaning would be chart, graph, or diagram are the meaning for tally table.
Venn diagram.
The answer depends on the nature of the event. If the event is composed of sub-events then a tree diagram may help but if not, it is irrelevant.
d
It would depend on the parents' genes and age. Globally, the probability is approx 0.483