A Customer Service Center Keeps Track of the Number of Complaints

A customer service center keeps track of the number of complaints received each day about one of their new products. The numbers of complaints received over the last 11 Day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The standard deviation for This sample of data is

A) 0.842.
B) 2.794.
C) 1.845.
D) 0.569.
E) None of the above.