<｜begin▁of▁sentence｜>### Instruction:
Given a series of numbers (10, 20, 30), can you use the RunningMean class to calculate the running mean and then print its string representation using the __str__ method?
### Response:
from RunningMean import RunningMean

# Create a RunningMean instance
current_mean = RunningMean()

# Add values
current_mean.add_value(10)
current_mean.add_value(20)
current_mean.add_value(30)

# Get the current running mean as a string representation
print(str(current_mean))
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