Brent thinks about how much he will need to pay for car insurance. he thinks that it would be a good idea to get quotes on auto insurance for the models that he is considering. he also thinks about the truck's gas mileage and how the truck was rated.

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?