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Trial 4:

34.4mL-26.2mL=8.2mL

(8.2/1000)/(10mL/1000)=0.82M

Trial 5:

42.65mL-34.4mL=8.25M

(8.25mL/1000)/(10mL/1000)=0.825M

Trial 6:

44.6mL-36.65mL=7.95mL

(7.95mL/1000)/(10mL/1000)=0.795M

Average Molarity:

(0.89M+0.81M+0.82M+0.82M+0.825M+0.795M)6=0.842M

% Deviation:

(0.825-0.810)/0.842*100=1.78%