Untitled

Japanese<- c(84,63,61,49,89,51,59,53,79,91
)

stem(Japanese)

## 
##   The decimal point is 1 digit(s) to the right of the |
## 
##   4 | 9
##   5 | 139
##   6 | 13
##   7 | 9
##   8 | 49
##   9 | 1

## 
##   The decimal point is 1 digit(s) to the right of the |
## 
##   4 | 9
##   5 | 139
##   6 | 13
##   7 | 9
##   8 | 49
##   9 | 1



mean(Japanese)      #平均數

## [1] 67.9

median(Japanese)    #中位數

## [1] 62

as.numeric(names(table(Japanese)))[which.max(table(Japanese))]  #眾數

## [1] 49

sd(Japanese)  #標準差

## [1] 16.25115

var(Japanese) #變異數

## [1] 264.1

Q1 <- quantile(Japanese, 1 / 4) 
Q3 <- quantile(Japanese, 3 / 4) 
Q1

##  25% 
## 54.5

Q3

##   75% 
## 82.75