Calculate the relative frequencies for each tar class for both nonfiltered and filtered cigarettes by dividing the frequency of each class by the total number of observations for each type, then express the result as a percentage
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Reference: Metal Concentrations in e-Cigarette Liquid and Aerosol Samples: The Contribution of Metallic Coils by Pablo Olmedo, Walter Goessler, Stefan Tanda, Maria Grau-Perez, Stephanie Jarmul, Angela Aherrera, Rui Chen, Markus Hilpert, Joanna E
(en) Reuters, FACTBOX-Leading cigarette manufacturers by sales , sur www.reuters.com, (en) Judith Mackay et Michael P
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Empty cartridges for the Halo G6 cost $8.99 and come in packs of five