AP Stats - Chapter 5 - The Standard Deviation as a Ruler and the Normal Model

In 1998, Mark McGwire hit 70 homeruns,
to break the single season home run record of 61 home runs set by Roger Maris in 1961. McGwire later admit ted to using performance enhancing steroids that sea son. Even so, how did McGwire's performance really compare to Maris's? The league was very different in 1998 than in 1961. The table below shows the mean and standard deviations for the number of home runs scored by all players with at least 502 plate appearances in their respective seasons. Use these to determine who's home run feat was more impressive.