1. Using R statistical functions, find median, mean, variance and standard deviation of the following:

a) 3, 12, 11, 7, 5, 5, 6, 4, 10

b) 16, 19, 10, 24, 19

c) 8, 2, 8, 5, 5, 8

d) 28, 39, 42, 29, 39, 40, 36, 46, 41, 30

e) 133, 215, 250, 108, 206, 159, 206, 178

Research ways that the function mode has been implemented in R.

Explain one of them.