Handicap Calculation for Dave Levinson for Week 19

Week of Rounds Used:		15	14	13	12	11		Total		Average		90%		Rounded to:
Gross Score:		57	53	57	53	54		274		54.80
Hdcp Score (over Par):		20	17	20	18	18		93		18.60		16.74		17

What does this mean? How are handicaps calculated?
Handicap Projection for Dave Levinson for Week 20

If your next round score is:		Your new Handicap will be:
41-46		15
47-51		16
52-57		17
58-62		18
63-68		19