probability問題(急)

P(D)= 0.80 means it has 80% chance event D will occur...is 3/4 chance

P(A)=0.15 means it has only 15% chance occur..so least likely 0.6 / 4 chance

P (C)=0.55 hase close to 50 - 50 chance...that mean least predictable close to 2/4 chance

2007-03-22 14:23:42 補充：
P(A)=0.15 means it has only 15% chance occur..so least likely 0.6 / 4 chancesince the chance of event A not occur is 85%..B is 70% C is 45% ad D is 20% from that assumption we can say P(a) is the most predictable event not will not occur....you are so lazy...

2007-03-22 14:25:05 補充：
correction not: most predictable event not will not occur.... to ...most predictable event that will not occur

2007-03-22 14:25:07 補充：
correction not: most predictable event not will not occur.... to ...most predictable event that will not occur

Why (D) is most likely event?
The definition of probability is that:
If we denote by nA the number of occurrences of an event A in n trials, then if
圖片參考：http://upload.wikimedia.org/math/8/c/5/8c510fa1bd5f3f5526e3b4845afddcfb.png

The value of P(D) is that highest among the other three.
Higher the P(E) is,
higher the number of occurences of event E is.
Therefore D is the most likely event.
Why (A) are least likely events?
According to the definition of probability,
less the probability of event E is,
less the number of occurences of E is.
And P(A) is the least among the other three,
therefore A is the least likely event.
Why (A) is most predictable event?
1-P(A)
=1-0.15=0.85
The probabilty that event A do not happen is the highest.
We can more confident that A will not happen.
Therefore it is the most predictable event.
Why (C) is least predictable events?
1-P(C)
=1-0.55=0.45
Therefore the probabilty that P(C) do not happen is 0.45.
It is very close to P(C).
Therefore we are least confident to predict will C happen.
Therefore C is the least predictable event.