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In a study of the hormone melatonin on sleep patterns, test subjects were given a dose of melatonin to decrease

the amount of time that it took them to fall asleep. In the study, 62 patients required a dose of 2.0 mg, 54 required a dose of 3.0 mg, 39 required a dose of 4.0 mg, and 29 required a dose of 5.0 mg. Calculate the weighted mean dose of melatonin required to reduce the amount of time that it took participants of the study to fall asleep in milligrams

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