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Find the following percentiles for the data listed below. Please show all work. 

15, 18, 35, 36, 21, 36, 38, 39, 40, 21,18, 19, 22, 23, 20, 24, 25, 26, 29, 21

a) The 30th percentile

b) The 60th percentile

c) The 82nd Percentile