Answer:
30.4%
Step-by-step explanation:
First, let's add up the total number of marbles:
Total marbles = 9 (black) + 2 (pink) + 5 (orange) + 7 (yellow) = 23 marbles
Next, we determine the fraction of yellow marbles:
Fraction of yellow marbles = 7/23
To convert this fraction to a percentage, we multiply by 100:
Percentage of yellow marbles = 7/23 * 100
Therefore, approximately 30.4% of the marbles are yellow.