[tex]\overline{x} = \frac{2 \times 4 + 1 \times 6 + 5a + 10 \times 3}{4 + 6 + 5 + 3} \\ \\ \overline{x} = \frac{5a + 44}{18} \\ \\ \frac{5a + 44}{18} = 3 \frac{5}{9} \\ \\ \frac{5a + 44}{18} = \frac{32}{9} \\ \\ 45a + 396 = 576 \\ \\ a = 4 \\ [/tex]
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[tex]\overline{x} = \frac{2 \times 4 + 1 \times 6 + 5a + 10 \times 3}{4 + 6 + 5 + 3} \\ \\ \overline{x} = \frac{5a + 44}{18} \\ \\ \frac{5a + 44}{18} = 3 \frac{5}{9} \\ \\ \frac{5a + 44}{18} = \frac{32}{9} \\ \\ 45a + 396 = 576 \\ \\ a = 4 \\ [/tex]