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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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MathsIsFun
2005-09-20 18:56:47

If you look here you can see what that "mound shape" looks like

Now,  0.230 is just 1 Standard Deviation from 0.260 (0.230 + 10.03 = 0.260), and when you look up the table you find 1 Standard Deviation = 0.3413, this means that 34.13% of the population are between 0.230 and 0.260, now 50% are above the mean of 0.260, so 84.13% (34.13%+50%) are above 0.230.

april64
2005-09-20 09:36:22

I am having trouble trying to solve this equation. 

Batting averages of major league baseball players are thought to possess a mound-shaped symmetric distrution with a mean of .260 and a standard deviation of .03.  Find the proportion of major league baseball players who have a batting average that exceeds .230.

Thanks!

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