Use the following information:

 $\displaystyle {s}_{{1}}={5.5},{n}_{{1}}={17},{s}_{{2}}={6.3},{n}_{{2}}={24}$ 

and the formula to compute the pooled standard deviation:

 $\displaystyle {s}_{{p}}=\sqrt{{\frac{{{\left({n}_{{1}}-{1}\right)}{{s}_{{1}}^{{2}}}+{\left({n}_{{2}}-{1}\right)}{{s}_{{2}}^{{2}}}}}{{{n}_{{1}}+{n}_{{2}}-{2}}}}}=$ (Round the answer to 2 decimals)