Sampling Distribution Applet (SageMath)

Below is the applet that demonstrates the sampling distribution of sample means,which should open automatically using Sage Cell.
This applet takes m samples of n uniformly distributed random integers between 0 and 9.
The output is a histogram of the sample means, and the mean of the sampling distribution (which approximates the mean of the population).
Try playing around with the sliders -- what happens to our results as we increase both numbers?