The data shows the number of grams of fat found in 9 different health bars.
11, 11.5, 10.5, 17, 14.5, 14.5, 18, 17, 19

what is the iqr for the data?

answer choices:
6.25
7
14.5
17.5

don't guess, show your work. i really don't understand

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?