A survey of 60 customers was taken at a
bookstore regarding the types of books purchased. The survey found that
36 customers purchased mysteries
28 purchased science fiction
19purchased romance novels
14 purchased mysteries and science fiction
10 purchased mysteries and romance novels
7 purchased science fiction and romance novels
3 purchased all three types of books.
To figure out how many purchased exactly two types of books Chris made this Venn diagram showing cardinality of each region.
So, how many purchased mysteries but not romance novels?
1 answer
According to the Venn diagram, the region that represents customers who purchased mysteries but not romance novels has a cardinality of 36 - 10 - 3 = 23. Therefore, 23 customers purchased mysteries but not romance novels.
1 answer