Quest Diagnostics performs different types of blood tests. Historical data showed that the average number of blood tests ordered by doctors per patient was 1.78. Last month, 1540 patients were randomly sampled, and it was found that 18 blood tests were not performed correctly (e.g., wrong procedure used, wrong chemical used, etc.). What was the value of errors per million opportunities (epmo) for Quest Diagnostics last month? Please take up to seven decimal point in your calculations.

A. Less than or equal to 4000

B. More than 4000 but less than or equal to 5000

C. More than 5000 but less than or equal to 6000

D. More than 6000 but less than or equal to 7000

E. More than 7000

The manager of a plant producing RFID scanners would like to know if defective scanners are related to certain time of the day during the first shift. A tool that would be most appropriate is a

Scatter diagram

Run chart

Cause-and-effect diagram

Pareto chart