Three landmarks of baseball achievement are Ty Cobb’s batting average of 0.420 in 1911, Ted Williams’s 0.406 in 1941, and George Brett’s 0.390 in 1980. These batting averages cannot be compared directly because the distribution of major league batting averages has changed over the years. The distributions are quite symmetric, except for outliers such as Cobb, Williams, and Brett. While the mean batting average has been held roughly constant by rule changes and the balance between hitting and pitching, the standard deviation has dropped over time.

Here are the facts:

Find the standardized scores for Cobb, Williams, and Brett. Who had the best performance for the decade he played?

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Decade Меan Standard deviation 1910s 0.266 0.0371 1940s 0.267 0.0326 1970s 0.261 0.0317