. Medical billing errors and fraud are common in the U.S. Research by a major accounting firm found that 30 out of 100 medical bills contain errors. A sample of 10 medical bills is selected.

• What type of probability distribution is the number of medical bills that contain errors? What are the key parameters? (10 points)
• What is the probability
  • No medical bills will contain errors? (10 points)
  • More than 3 medical bills will contain errors? (10 points)
  • At most 3 medical bills will contain errors? (10 points)

What is the mean and variance of the number of medical bills that contain errors? (10 points