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Prepare a legend on top left to show the lines and corresponding Mean or Median. HINT: It will use 5 arguments of. legend(). The first will be the string “toprigh” to tell R where to put the legend. The remaining 4 arguments will each be 2-long vectors created by R’s concatenate function, e.g., c(). These arguments are lty, lwd, col, and ... ................
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