A jar contains 5 blue marbles, 8 red marbles, 4 white marbles, and 3 purple marbles. Suppose you pick a marble at random without looking. Find the probability of each event. Write your answer as a fraction in simplest form. P(not white)?

Here are the steps:

1. Find the total number of marbles. This is equal to 5+8+4+3=20 marbles in all.
2. Probability of getting blue=number of blue marbles/total number of marbles=5/20=1/4
3. Following same formula as on top, Red=8/20=2/5
4. White=4/20=1/5
5. Purple=3/20
6. Probability of getting a marble NOT white. Add all marbles except white/total number of marbles=16 marbles/20 marbles=4/5