The number of visitors at a theme park by season and year has been recorded and is given in the following table:
|
Quarter
|
2003
|
2004
|
2005
|
2006
|
|
Winter
|
48
|
51
|
43
|
18
|
|
Spring
|
55
|
42
|
47
|
11
|
|
Summer
|
50
|
48
|
12
|
13
|
|
Fall
|
11
|
21
|
11
|
19
|
Evaluate the seasonal index for Summer by using all of the data.