Write a function that uses Monte Carlo to approximate the distribution of the sample proportion of Heads from n coin tosses of a coin (which may or may not be a fair coin). The function should take as input the sample size n, the probability of heads p, the number of replicates (repetitions of the experiment) B and a boolean plotHist that if TRUE prints a histogram of the samples and if not, does not. If the user does not input a value for B, default to the one we often use in class, that is, set B = 10,000. The output of the function should be the mean and standard deviation of the distribution