Given : Absorbance of the sample solution is "0.152AU"
Repeatability standard deviation = "0.005 AU \\implies e_1=0.005 AU"
Uncertainty due to possible drift "=\u00b1 0.001AU \\implies e_2= 0.001AU"
Uncertainty due to the possible interfering effects is "\u00b1 2\\%" of the absorbance value.
"\\implies e_3=0.02*(0.152)=0.00304=0.0030AU" (rounded off upto four decimal places).
where "e_1,e_2 , e_3" are errors due to uncertainty in repeatability, drift of the photometer and due to possible interfering effects respectively.
Thus, the combined standard uncertainty of absorbance "=e_1+e_2+e_3=0.0050+0.0010+0.0030=0.0090 AU" ---(Answer)
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