Final answer:
The question does not provide data on Citizen Kane's viewership. However, an example calculation using given data shows that approximately 13.10% of surveyed EVC students attended a midnight showing of a Harry Potter movie, which is a different context.
Step-by-step explanation:
The question regarding what percentage of people have seen Citizen Kane, claimed by many to be the greatest film ever made, does not directly provide statistical data about viewership of Citizen Kane.
However, the information provided does mention statistics about students attending a midnight showing of a Harry Potter movie at Evergreen Valley College (EVC). Specifically, it notes a hypothesis that fewer than 20 percent of EVC students attended this showing.
To evaluate this hypothesis, a statistics instructor surveyed 84 of her students and found that 11 attended the midnight showing. To calculate the percentage, the formula is (number of attendees / sample size) * 100, which would be (11 / 84) * 100 ≈ 13.10%.