To find the expected height of a student who is 22 years old using the given equation of the trend line \( y = 3.5x + 26 \), you can substitute \( x \) with 22.
Hereβs the calculation:
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Substitute \( x \) with 22:
\[ y = 3.5(22) + 26 \]
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Calculate \( 3.5 \times 22 \):
\[ 3.5 \times 22 = 77 \]
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Add 26 to the result:
\[ y = 77 + 26 = 103 \]
So, the expected height of a student who is 22 years old is 103 inches.