Answer:
50%
Step-by-step explanation:
Assuming that each marble can be picked with equal probability, we notice that there is a total of

marbles, of which 2 are red.
So, the probability of picking a red marble is

In fact, as in any other case of (finite) equidistribution, we used the formula

Answer:

Step-by-step explanation:
= 
Answer:
2 and 3/4 of a cup
Step-by-step explanation: