An Analyst Is Assigned a Blind Quality Control Sample of Blood

Multiple Choice

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 %RSD using the sample standard deviation and report to two significant figures. Use a spreadsheet or calculator.

A) 3.9
B) 1.5
C) 4.2
D) 4.8