• 12

  • 12.5

  • 15

  • 18.5


Average = ( 3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27 ) / 9 = 3(1+2+3+4+5+6+7+8+9)/9 = ( 45 / 3 ) = 15

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