Handicap Calculation for Sheri Gazda for Week 15

Week of Rounds Used:		14	13	12	11	9		Total		Average		90%		Rounded to:
Gross Score:		60	65	58	63	64		310		62.00
Hdcp Score (over Par):		22	26	21	24	25		118		23.60		21.24		21

What does this mean? How are handicaps calculated?