1) What makes you angry?
People obsessing over things of no true importance. Stressing over things of little importance. Lack of communication. Ignorance and Arrogance (as I think everyone's covered). People who criticise others without any basis or background for their idle words...esp. when it's to make fun of someone!!!!
2) Do you get angry often?
Mildly yes. Intense?...the world couldn't survive many of these...
3) How do you deal with the problem?
Through confrontation or yelling or some form of physical exertation...could include walking extremely hard, punching (pillow or person), crying into an innocent pillow, etc. 
4) How quick are you to resolve this emotion?
Depends on the person. My mother has a bad habit of being nice to me when I'm angry at her, and how can I stay angry when she's asking me if I'd like a grilled cheese sandwich? Others, I can fume at longer than I care to recall...
5) When you get angry, are your friends and family generally surprised at the content that makes you so?
My family of SJ parents and two brothers (NT and SP) don't understand me at all. When I'm upset about something, they usually can't comprehend why I'm "obsessing" over it...that is, if they notice I'm upset at all. My best friend (INFP) is a complete life saver! I vent about little things, and she understands! I wish the world was the same!