The standard deviation for the activity is
问题:
The standard deviation for the activity is ______.
A) 1.66 days
B) 5.00 days
C) 3.88 days
D) 6.05 days
The standard deviation for the activity is ______.
A) 1.66 days
B) 5.00 days
C) 3.88 days
D) 6.05 days