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 Hey coach, that's unfair! (Posted on 2003-01-05)
A first baseman is fortunate enough for his team to be playing in the World Series. When game one is about to start, he asks the coach if he's going to play. The coach responds "despite the fact that you have a higher batting average than our rookie first baseman, we're up against a left handed pitcher today, and he has a better average against lefties than you, so I'm going to play him". Well, the fellow figures that this is fair enough, baseball being a game of averages and all, and happily sits out the first game, knowing that the team will come up against a right hander at some point, giving him a chance to play.

Sure enough, game 2 is set to start, and the opponents are starting a right handed pitcher. The fellow asks the coach if hes going to play today. The coach responds "well, I know that you have a better average overall, but today we're facing a rightie, and our rookie has a better average against righties than you do, so we're going to play him today".

So, the regular player, who has a better average against pitchers in general, has a lower average against BOTH left and right handers????? The player feels cheated. How did this happen?

For reference, the players batting average is calculated using the following formula:
average = safe hits/at bats, and is recorded to three decimal places (though announcers generally multiply this fraction by 1000 to give a integer value). A good players average will be between .300 and .350, with higher averages possible, but rare. For example a player gets 20 safe hits in 80 "at bats" then his average is .250

 Submitted by Cory Taylor Rating: 3.1818 (11 votes) Solution: (Hide) This situation can occur due to the proportional averaging. To illustrate, the following example satisfies the players dilemna. Rookie - LH 3/8=.375, RH 7/30=.233, Total (3+7)/(8+30)=.263 Regular - LH 58/166=.349, RH 80/356=.224, Total (58+80)/(166+356)=.264 There are obviously many other sets of numbers that create this situation

 Subject Author Date Answer Math Man 2012-02-16 22:57:17 A simple example with explanation (solution) Viet 2005-06-17 01:31:31 something completely different Bruce Brantley 2004-08-29 16:07:50 answer ethan 2003-05-19 17:13:06 Completely Different Possibility Jim Lyon 2003-01-06 06:36:59 A concrete example TomM 2003-01-05 13:05:13 First thoughts TomM 2003-01-05 12:53:23 basic idea Alan 2003-01-05 12:38:21

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