Question

Charles claims he can act as a random number generator. Samantha has doubts. She tells Charles to write down 50 random digits, suspecting that he won't write down 50 random digits, suspecting that Charles produces fewer zeros than the expected 10%? Samantha simulated 100 trails of choosing 50 random digits, assuming that zero has a 1/10 chance of occurring each time. The dotplot shows the number of zeros in each trial. A) Explain how the graph illustrates chance variation. B) Based on the results of the simulation, is there convincing evidence that Charles doesn't choose zero often enough when he's trying to generate random number? Explain.