Evaluate the Riemann sum for $\displaystyle {f{{\left({x}\right)}}}={1.1}{x}-{1.6}{\sin{{\left({2}{x}\right)}}}$ over the interval $\displaystyle {\left[{0},{3}\right]}$ using six subintervals, taking the sample points to be midpoints. $\displaystyle {M}_{{6}}=$    Round your answer to 6 places. Remember not to round too early in your calculations.