A random sample of 11 hikers produced the following data, where x is the age of the hiker, and y is the maximum number of miles hiked per week. The data are presented below in the table of values.

x y

6 19
7 26
10 35
13 34
14 36
17 45
18 44
20 54
23 48
24 67
25 53

What is the value of the intercept of the regression line, b, rounded to one decimal place?