64 percent is out of 100 which is 64/100 which simplifies down to 16/25 I believe
Of the 12 available months, 
of them end in the letter "r" (Sep, Oct, Nov, Dec). The sample space consists of all 12 possible choices of 1 month, but the only outcome we care about is any 1 of these 4 being selected. The probability of choosing any one of these is 
. How you describe the probability is up to interpretation, but probably a good convention to use is to say that an event is "unlikely" to happen if that event has a probability less than 0.5 of occurring.
<span>(3x2 + 16x + 9) + (−16x − 12)
= </span>3x2 - 3
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