A box contains 9 red and 2 blue marbles. If you select one marble at random from the box, determine the odds against selecting a blue marble.

2/11 or approx. 18%

Step-by-step explanation:

There are 2 blue marbles out of 11 total marbles, so the probability will be 2/11.

2/11 = 0.18, or 18%

So, the odds are 2/11 or approx. 18%

9:2

Step-by-step explanation:

9 red  and  2 blue

ways that an outcome cannot occur : how many ways it can occur

9 : 2  are the odds against a blue marble

2