Answer
(a)
Horizontal axis shows a person’s age,vertical axis shows that person’s body-mass index (BMI), computed using the following formula
\[\text{BMI}=\frac{703W}{{{H}^{2}}}\]
\[W=200\], \[H=72\], BMI is
\[\begin{align}
& \text{BMI}=\frac{703\left( 200 \right)}{{{72}^{2}}} \\
& =\frac{140600}{5184} \\
& =27.1219 \\
& =27.1
\end{align}\]
Now, rounding to the nearest tenth,
Hence, \[\text{BMI}=27.1\]
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