a = c(10, 2, 19, 24, 6, 23, 47, 24, 54, 77)

mean(a) #calculate the arithmetic mean
[1] 28.6

median(a) #calculate the median
[1] 23.5

var(a) #calculate the variance
[1] 561.8222

sd(a) #calculate the standard deviation
[1] 23.70279

max(a) #shows the larger value of the sequence
[1] 77

min(a) #shows the smallest value of the sequence
[1] 2

sum(a) #sum all the values
[1] 286

sum(a)*sum(a) #calculates the square of the sum of all values
[1] 81796

sum(a*a) #calculates the sum of the squares of all values
[1] 13236

sum(rank(a)) #sum of ranks assigned to the variables contained in a
[1] 55

sum(rank(a)[1:6]) #sum of ranks assigned to the first 6 values of a
[1] 21.5