To find the height of the infant son, we need to calculate \( \frac{1}{4} \) of the father's height. The father's height is \( 6 \frac{2}{3} \) feet, which we can convert to an improper fraction:
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Convert \( 6 \frac{2}{3} \) to an improper fraction: \[ 6 \frac{2}{3} = \frac{6 \times 3 + 2}{3} = \frac{18 + 2}{3} = \frac{20}{3} \text{ ft.} \]
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Now calculate \( \frac{1}{4} \) of \( \frac{20}{3} \): \[ \text{Son's height} = \frac{1}{4} \times \frac{20}{3} = \frac{20}{12} = \frac{5}{3} \text{ ft.} \]
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Converting \( \frac{5}{3} \) to a mixed number: \[ \frac{5}{3} = 1 \frac{2}{3} \text{ ft.} \]
So, the height of his son is \( 1 \frac{2}{3} \) ft.
The correct response is:
1 2/3 ft.