[tex]1. \frac{x}{3} = \frac{14}{21} [/tex]
[tex]x \times 21 = 14 \times 3 \\ x = \frac{14\times 3}{21} = 2 \\ x = 2[/tex]
[tex]2.media = \frac{4 \times 2 + 5 \times 4 + 6 \times 4 + 7 \times 4 + 8 \times 6 + 9 \times 5 + 10 \times 3}{2 + 4 + 4 + 4 + 6 + 5 + 3} = \\ media = \frac{8 + 20 + 24 + 28 + 48 + 45 + 30}{28} = \frac{203}{28} = 7.25[/tex]
