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The frequency table shows the results of three surveys that each recorded the number of trees per block for four blocks in a city.

Based on the unbiased surveys, estimate the median number of trees per block in the city. Round to the nearest whole number.

Survey Trees per block
#1 {10,16,14,20}
#2 {11,17,15,21}
#3 {18,16,13,13}


A 13

B 15

C 16

D 21