17 of33 Mean and Sample Size Training
  Figuring out the mean is really useful, and the bigger your sample size, the better your results will be. A softball player who's been at bat over 1000 times in her life will know, based on her batting average, how often she'll get a hit, while a rookie who's only been at bat 10 times can't really predict very accurately how she'll perform.
Batting Average formula
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