To solve this, we need to calculate the probability of randomly selecting a green ball from the box.

Step-by-step breakdown:

1. Total number of balls in the box:

   • White balls = 18
   • Red balls = 27
   • Green balls = 15

   The total number of balls is: $\text{Total} = 18 + 27 + 15 = 60$

2. Number of green balls = 15.

3. Probability formula: The probability of selecting a green ball is the ratio of the number of green balls to the total number of balls: $P(\text{Green}) = \frac{\text{Number of Green Balls}}{\text{Total Number of Balls}} = \frac{15}{60} = 0.25$

Conclusion:

The probability of selecting a green ball is 0.25.

Would you like more details on this or any other clarifications?

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Here are 5 related questions:

1. What is the probability of selecting a red ball?
2. What is the probability of selecting a white ball?
3. What is the probability of not selecting a green ball?
4. If 3 balls are removed, what is the new probability of selecting a green ball?
5. What if another color of balls is added to the box?

Tip: Probabilities always sum to 1 for all possible outcomes in an experiment!