The Silver Sword - Wonderings and Words

Since 64 68 2(2), the value is 2 standard deviations below the mean. The 68-95-99.7 rule indicates that 95% will be within 2 standard deviations, 4 inches, of the mean height. Male students less than 64 inches tall are half of the 5% of male students who are taller than 68 4 72 inches or shorter than 68 4 64 inches. ................
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