If the distribution of heights were symmetric then it would be 1/2 but the distribution is not at all likely to be symmetric. There will by many young trees of varying heights whereas the mature trees are likely to reach similar heights. The distribution is, therefore, likely to be negatively skewed, which means that the probability is greater than 1/2.
Diameter at Breast Height
diameter at breast height (DBH)
Usually the height of the plant from ground level.
From a probability perspective fair means equal probability.
Read the introduction to probability and probability measures at StatLect.com
It means multiply, Probaility of A and B means probability of A multiplied by probability of B.
The mean of a binomial probability distribution can be determined by multiplying the sample size times the probability of success.
The probability level for an outcome is the probability that the outcome was at least as extreme as the one that was observed.
The significance of the mean of a probability distribution is that it is the most probably thing to happen. The mean is the average of a set of values. If it is the average of a probability distribution, it is the most probable part.
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Dependent probability is the probability of an event which changes according to the outcome of some other event.
It is the probability of an event calculated from repeated trials of an experiment.