Question 1102593
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"the odds of macy passing her driver's test on the first try are 12:13" means that Macy will pass 12 times out of 12+13 = 25 total. 
The ratio 12:13 indicates there are 12 successes for every 13 failures. This is assuming "odds in favor". 
For "odds against", you would flip the ratio. Eg: Saying "odds against a horse winning a race is 20:1" means there are 20 failures for every 1 success


If we assume "odds in favor", then divide the two values (12 and 25) to get: 12/25 = 48/100 = <font color=red>0.480</font>
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