A random sample of adults in El Paso was asked how many books they typically read in a year. The following contingency table shows these results along with their age group.
|
Number of Books
|
Less than 40 Years Old
|
40 Years or More
|
|
None
|
15
|
27
|
|
1-2
|
21
|
30
|
|
3-5
|
24
|
36
|
|
6-10
|
18
|
33
|
|
11 or more
|
42
|
54
|
The probability that a randomly selected person from this sample typically reads 6-10 books per year or is 40 years or older is ________.