A study was recently performed by the Internal Revenue Service to determine how much tip income waiters and waitresses should make based on the size of the bill at each table. A random sample of bills and resulting tips were collected. These data are shown as follows: Total Bill Tip $126 $19 $58 $11 $86 $20 $20 $3 $59 $14 $120 $30 $14 $2 $17 $4 $26 $2 $74 $16 Based upon these data, what is the approximate predicted value for tips if the total bill is $100? a) $26.03 b) $12.88 c) $20.61 d) $15.55