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9. What mass of water is produced from the complete combustion of 4.40×10−3 g of methane? Calculate the z-score for a student receiving a 77.5 on a test with a mean of 87.5 and a standard deviation of 3.84.? Why can't we just use the empirical rule all of the time instead of learning how to calculate the z-scores? If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? Why is it that the scientific advancements of the last 25 years are so unimpressive compared to those of the preceding 25 years?