The top four grossing superhero movies and their grosses (in millions of dollars adjusted to 2014 ticket prices) are shown in Table 14.
Table 14
Grosses of Superhero Movies
Movie Gross (millions of dollars)
Marvel’s The Avengers ……………………………….. 641
The Dark Knight ………………………………………. 622
Spider-Man ……………………………………………. 580
Batman ………………………………………………… 526
Let n be the number of movie titles listed in Table 14, and let xi be the gross (in millions of 2014 dollars) of the movie listed in the ith row of the table.
a. Find the values of x1, x2, x3, and x4.
b. Find Σxi. What does it mean in this situation?
c. Find Σxi/n. What does it mean in this situation?