Question 733215
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A box contains 278 red marbles and 45 yellow marbles. If you draw one marble at random, 
what is the probability, to the nearest percent, that it is yellow
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The rational and the decimal expressions for the probability are  

    P = {{{45/(278+45)}}} = {{{45/323}}} = 0.13932  (rounded).


In the percentage form, it is  13.932%.


To the nearest percent this is 14%.
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Solved.


The answer in the post by @lynnlo is incorrect.