32 Required Information Part 5 of 5 The processing of raw coal involves \"washing," in which coal ash (nonorganic, incombustible material) is removed. The _ article \"Quantifying Sampling Precision for Coal Ash Using Gy's Discrete Model of the Fundamental Error" (Journal of Coal Quality, 1989:3339) provides data relating the percentage of ash to the volume of a coal particle. The average percentage of ash for six volumes of coal particles was measured. The data are as follows: if; Volume (cm3) I 0.01 I 0.06 l 0.58 2.24 15.55 276.02 Percentash | 3'32 | 405 l 5.69 706 8.17 936 Using the most appropriate model, construct a 95% condence interval for the mean percent ash for particles with a volume of 50 cm3. Round the answers to three decimal places. The 95% condence interval is