a mass of green algae in the shore, the probability of the green algae coming from bellow 3m?

algae-3m-6m-9m
red----70--25--13
green-56--35---9
blue--132--55--12
this is how the depth and algae (grams/gallon) was found distributed

M32012-03-03T17:15:38Z

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P[algae from 3m | green] = 50/(70+56+132) = .1938 <-------