... 92 + 82 + 72 + 62 + 52 + 4 2 + 32 + 22 + 12 + 02 + (-1 )2 + (-2 )2 (-3 )2 + ( -4 ) 2 + (-5 )2 + (-6 )2 (-7 )2 + (-8 )2 + (-9 )2 + (-1 0)2 = 770. Average of the sum ... The correct answer is D.18.Range before transaction:112 -4 5 =67Range after transaction:( 94+ 24) -( 5 6-2 0)=11 8-3 6=82 The difference is: 8 2-6 7=15Answer is D19.Range: the difference between the ... 1, 2, 5, 5, 6, 7 53 4 1, 3, 4, 5, 6, 7 4. 5 4 3 1, 3, 4, 5, 6, 7 4. 55 2 1, 2, 5, 5, 6, 7 56 1 1, 1, 5, 6, 6, 7 5.5Regardless of the values of x and y, the median (4. 5, 5, or 5.5) is always...