0.560 0.644 0.722 0.800 0.878 1.034 Thorax Length 3,6: Use the sketch from Exercise 3.5 and shade in the appropriate areas to answer these questions. (a) 99.7% of all thorax lengths are within three standard deviations of the mean, or between 0.566 mm and 1.034 mm. (b) This is the area one or more standard deviations above the mean. Hence, 16% of thorax lengths exceed 0.878 mm