Answer:
The probability is 0.375
Step-by-step explanation:
The probability is calculated as a division between the number of options that satisfy an specific condition and the total number of options. So, if Marsha choose one marble from the bag, she has 32 possible options:
- 4 green marbles
- 8 yellow marbles
- 20 red marbles
From these 32 options, there are 12 that are not red:
- 4 green marbles
- 8 yellow marbles
Therefore, the probability P that the marble is not red is calculated as:
[tex]P =\frac{4+8}{4+8+20}=\frac{12}{32}=0.375[/tex]
