Answer:
10/62, 5/31, or 16.129%
Step-by-step explanation:
First you have to add all of the balloon colors together to get the entire sample size.
47 + 5 + 10 = 62
Next, you need to know the how many of the balloon colors you what the probabilty for that are in the sample size.
10 black balloons.
Finally, you divide the number of black balloons by total balloons to find the probability of randomly choosing one.
10/62 = 5/31 or 16.129%
I hope this helps!
-TheBusinessMan
