import numpy as np 

a = np.array( [ 1, 2, 3, 4,5 ] )

print( "합       : a.sum()  =", a.sum() )
print( "평균     : a.mean() =", a.mean() )
print( "분산     : a.var()  =", a.var() )
print( "표준편차 : a.std()  =", a.std() )