To predict the scores based on the hours worked using the line of best fit equation \( y = 4.81x + 17.4 \):
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For \( x = 15 \) hours: \[ y = 4.81(15) + 17.4 \] \[ y = 72.15 + 17.4 = 89.55 \] Rounding to the nearest whole number gives \( 90 \).
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For \( x = 9 \) hours: \[ y = 4.81(9) + 17.4 \] \[ y = 43.29 + 17.4 = 60.69 \] Rounding to the nearest whole number gives \( 61 \).
So the predicted scores are:
- For 15 hours: 90
- For 9 hours: 61