Yeah people tend to pick odd numbers more often than even because they look more random to people.
Two of the most commonly picked numbers between 1 and 100 when people do it are 37 and 73.
For the record I picked 4.
This is a very psycological type of game. Reminds me for some reason of the game
Mediocrity. Basically:
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The winner of a game of Mediocrity is the most "mediocre" player. In a three player game of mediocrity each player selects a number (lets say between 1-10). The player who selects the middlemost number is the winner! (Ties can be resolved by having a different fraction added to each player; this can be rotated). This is known as Level 0 mediocrity.
A Level 1 game of mediocrity involves playing N games (lets say 5) of Level 0 mediocrity. Of course the winner is the person with the middlemost number of Level 0 wins! The progression to higher Level (2+) games of mediocrity is quite clear. The strategy for higher level games of mediocrity (3+) is extremely difficult.
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Again it is all about trying to outguess what the others are going to do.