Sample	g BSA in well	Average Corrected ABS (594 nm)	Standard Deviation of Average Corrected ABS
1.000 mg/mL BSA	5.000	0.521
0.750 mg/mL BSA	3.750	0.512
0.500 mg/mL BSA	2.500	0.326
0.250 mg/mL BSA	1.250	0.156
0.125 mg/mL BSA	0.625	0.078
0.000 mg/mL BSA	0.000	0.000

How would I calculate the SD here?

Note: Each Average Corrected ABS was determined by taking the average of 3 observations and subtracting the blank value of 0.220. (I'm not sure if this is relevant or not)