what is the probability that the marshmallow is green?

Question

Kyle’s bowl of cereal has 5 blue marshmallows, 2 yellow marshmallows, 3 pink marshmallows, and 4 green marshmallows. If he picks one marshmallow at random, what is the probability that the marshmallow is green?

Answer 1

"he picks one marshmallow at random" means that it is equally-likely that each of the marshmallows is the one he picks.

 

Thus (definition),

   probability = (number of successful events) / (total number of possible events)  

     probability of picking a green = 4 / (5+2+3+4)

     probability of picking a green = 2/7