A company has 3 defective and 7 non-defective machines. Four machines are chosen at random one by one and without replacement from this company. Let p and p be the population proportion and sample proportion of defective machines, respectively. a. What proportion of machines in this company is defective? b. The following table is meant to show the sampling distribution of p, but there are some missing values from A to F. Find those missing values. p 0 A B P(p) 35/210 D E F C. Compute the mean of the sampling distribution of p. d. Is p an unbiased estimator of p? Provide evidence to support your argument