Required average = \\\\(\\begin{pmatrix}\\dfrac{50.25\ imes 16+45.15\ imes 8}{16+8}\\end{pmatrix}\\\\)= \\\\(\\begin{pmatrix}\\dfrac{804+361.20}{24}\\end{pmatrix}\\\\)= \\\\(\\dfrac{1165.20}{24}\\\\)= 48.55