Hi there!
#1 - The probability that a marble drawn at random will be blue is 307/1000. This is simplified to approximately 6/20.
#2 - The probability that a marble drawn at random will be green is 642/1000. This is simplified to approximately 13/20.
#3 - The probability that a marble drawn at random will be yellow is 51/1000. This is simplified to approximately 1/20.
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!