One important statistic in baseball is a pitcher’s earned run average, or ERA. This number represents the average number of earned runs given up by the pitcher per nine innings. The following table lists the portion of the ERAs for pitchers playing for the New York Yankees and the Baltimore Orioles as of July 22, 2010; the complete data, labeled ERA , are available on the text website. New York ERA Baltimore ERA
Sabathia 3.13 Guthrie 4.58
Pettitte 2.88 Millwood 5.77
Burnett 4.99 Matusz 5.21
Hughes 3.99 Bergeson 6.51
Vazquez 4.68 Hernandez 4.29
Chamberlain 5.80 Berken 2.50
Gaudin 6.81 Hendrickson 5.23
Rivera 0.98 Albers 4.31
Robertson 4.86 Arrieta 4.87
Park 5.93 Simon 3.14
Mitre 2.88 Ohman 2.57
Logan 3.92 Tillman 7.92
Marte 4.08 Mata 7.79
Aceves 3.00 Meredith 5.40
Moseley 7.50 Uehara 2.92
Melancon 9.00 Castillo 10.13
Albaladejo 5.40 Johnson 6.52
Mickolio 7.36
Gonzalez 18.00

Required:
a. Calculate the mean and the median ERAs for the New York Yankees.
b. Calculate the mean and the median ERAs for the Baltimore Orioles.
c. Based solely on your calculations above, which team is likely to have the better winning record?

1. New York Yankees
2. Baltimore Orioles