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--- b:head_first_statistics:measuring_central_tendency [2024/09/09 08:30] – [e.g. 2] hkimscil
+++ b:head_first_statistics:measuring_central_tendency [2024/09/09 09:50] (current) – [mean] hkimscil
@@ Line 31: / Line 31: @@
 \begin{equation*}
 \begin{split}
-\mu = \frac{\sum\limits_{}^{} \text{fx}}{\sum{\text{f}}}
+\mu = \frac{\sum\limits_{}^{} \text{fx}}{\sum{\text{f.nothing}}}
     = \frac{1 \text{x} 19 + 3 \text{x} 20 + 1 \text{x} 21}{5}
 \end{split}
@@ Line 267: / Line 267: @@
 <code>
 ## answer
+n <- 3+2+2 +3+4+4
+n
+mean.duckc <- 17
+median.duckc <- 17
+tot <- mean.duckc * n
+# 2 :: 4 인것은 이미 알고 있음
+known.sum <- (1*3)+(2*4)+(3*2)+(31*2)
+tot - known.sum
+# 227 = (32*4) + (33*3) 이므로
 duckc <- c(1,1,1,2,2,2,2,3,3,31,31,32,32,32,32,33,33,33)
 mean(duckc)