The answer for this problem can be computed in two ways:
1 bar or 1000 mbar = 750 mm Hg
0.907 bar = 907 mbar = 680.25 mm Hg.Or907 mbar * 10^-3/ 1.01325 = 0.8951
0.8951 atm *760mm Hg/1atm = 680.31 mm Hg would be the corresponding height of the mercury in the column of a mercury barometer.