Looking for help with javascript to autofill checkboxes based on a numeric value.

Question

I have a numeric field that I would like to have 1 - checkbox
out of five autofilled based on a numeric value.
For instance the numeric value is TotalPoints
If the TotalPoints Value is >10 autofill this checkbox
If the TotalPoints Value is 10 - 19 autofill this checkbox
If the TotalPoints Value is 20 - 49 autofill this checkbox
If the TotalPoints Value is 50 - 69 autofill this checkbox
If the TotalPoints Value is 70+ autofill this checkbox
Assistance in writing the correct script for this would be greatly appreciated.

Answer 1

All the checkboxes have separate names. 
Check box #1 is AssetClass.0 with the export value of 1
Check box #2 is AssetClass.1 with the export value of 2
Check box #3 is AssetClass.2 with the export value of 3
Check box #4 is AssetClass.3 with the export value of 4
Check box #5 is AssetClass.4 with the export value of 5
Score and StrategyUse the following calculation to determine your point score and indentify the appropriate strategy listed below.A. Add your points for questions 1 – 2.
B. Add your points for questions 3 – 12.
C. Subtract B from A. (Numeric Text Box)  name is TotalPoints
 Points Strategy Asset Class Mix (check boxes as named above)
 0 – 10 Primarily Fixed Income: 80% Fixed Income; 20% Equity
10 – 19 Balanced Fixed Income-Oriented: 60% Fixed Income; 40% Equity
20 – 49 Balanced Equity-Oriented: 40% Fixed Income; 60% Equity
50 – 69 Primarily Equity: 20% Fixed Income; 80% Equity
70+ Equity: 95%; 5% Cash