3. (5 marks) Medical billing errors and fraud are on the rise. According to Medical Billing Advocates of America, three out of four times, the medical bills that they review contain errors. Random sample of 10 medical bills is selected. a) Identify the random variable of interest. b) What is the probability that no medical bills will contain errors? c) What is the probability that exactly half of the medical bills will contain errors? d) What is the probability that more than 4 but no more than 7 medical bills will contain errors? e) What is the probability that no more than average number of medical bills will contain errors