Answer:
[tex]\frac{7}{30}[/tex]= 23.33%
Step-by-step explanation:
To knwo the probability of something happening you just have to do the next equation, you take the total number of outcomes, and the total number of outcomes desired, and you divide the total number of outcomes desired by the number of outcomes possible.
Probability=[tex]\frac{Outcomes desired}{total number of outcomes}[/tex]
In this case you have a total of 30 marbles, thats the total number of outcomes possible.
And you have in the bag 7 black marbles that your number of outcomes desired.
Probability=[tex]\frac{7}{30}[/tex]
Probability in %= 23.33%
