The time (in minutes) required for a group of workers to cooperate to complete the assembly process of a part are as follows:

（1） Find common statistics ;

X <- c(35,38,44,33,44,43,48,40,45,30,
          45,32,42,39,49,37,45,37,36,42,
          31,41,45,46,34,30,43,37,44,49,
          36,46,32,36,37,37,45,36,46,42,
          38,43,34,38,47,35,29,41,40,41)
psych::describe(X)  

（2） Make stem and leaf map , The unit for taking the stem is 10, The unit of leaf is 1.

stem