An Analyst Is Assigned a Blind Quality Control Sample of Blood

An analyst is assigned a blind quality control sample of blood containing a drug metabolite. He tests ten separate portions and obtains the following data for the concentration in ug/mL:
25.2
24.8
26.6
27.0
24.0
26.0
25.5
26.3
24.9
23.9
Calculate the sample standard deviation and report to three significant figures. Use a spreadsheet or calculator.

A) 0.995
B) 1.06
C) 9.95
D) 1.00
E) 23.0