How many firewalls users have tried? -> simply sum of checkboxes from question:
Which firewalls have you tried?
and last chart is simply sum by columns for same question, I think it makes perfect sense.
EDIT:
Possibly I expressed myself poorly in this answer. (Sorry)
EDIT:
Edited results page and added some explanation
Last edited by graudeejs; 11th May 2011 at 08:28 PM.
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