In Figure 2(a),the parameter p
is equal to 0.8–thatisquite high:you wouldbeunlikelytohavetowait
longfor theﬁrstsuccessful trial. In Figure 2(b),the valueofthe parameter
p is much lower–the probabilityofsuccessisonly0.3. In thiscase, you
mighthavetowaitquite alongtime forthe ﬁrst successtooccur.
Whatever thevalue of p,however,the decreasing natureofthe p.m.f.
meansthatthe most likelyvalueofXis 1.
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