A movie theater conducted a survey of its customers. Twelve people were selected at random and asked how many times they had gone to a movie theater in the past month. The movie theater recorded the results.
1, 4, 2, 7, 3, 11, 3, 5, 1, 1, 1, 3
What was the estimated mean number of movies a customer has seen?
A. 1
B. 3
C. 3.5
D. 4.3