To calculate the probability of picking a yellow ball, we first need to determine the total number of balls.
From your description, we have:
- Green marbles: 2
- Orange balls: 1
- Pink balls: 2
- Red balls: 1
- Blue balls: 1
- Purple balls: 1
- Yellow balls: 1
Now, let's count the total number of balls:
- Total = 2 (green) + 1 (orange) + 2 (pink) + 1 (red) + 1 (blue) + 1 (purple) + 1 (yellow)
- Total = 2 + 1 + 2 + 1 + 1 + 1 + 1 = 9
Now, we see that there is 1 yellow ball in the pile.
The probability of picking a yellow ball is given by the formula:
\[ \text{Probability}(\text{yellow}) = \frac{\text{Number of yellow balls}}{\text{Total number of balls}} = \frac{1}{9} \]
Now we'll convert \(\frac{1}{9}\) to a decimal:
\(\frac{1}{9} \approx 0.1111\)
Thus, the probability that the ball picked is a yellow ball is approximately:
Probability(yellow) = 0.1111