Respuesta :
Answer:
4/10 or 40%
Step-by-step explanation:
Their is 10 marbles in all and their is 4 black marbles so,
4/10 or 40%
Hope my answer has helped you and if not i'm sorry.
[tex]|\Omega|=10\\|A|=4\\\\P(A)=\dfrac{4}{10}=\dfrac{2}{5}=40\%[/tex]