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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