The modulus of $ z $ is:
$$ |z| = 8.3718$$To find modulus of a complex number $ z = a + bi $ we use formula:
$$ |z| = \sqrt{a^2 + b^2} $$In this example we have $ a = 8.1371 $ and $ b = 1.9688 $ so:
$$ \begin{aligned}|z| &= \sqrt{ 8.1371^2 + 1.9688^2 } \\[1 em]|z| &= \sqrt{ 66.2117 + 3.876 } \\[1 em]|z| &= \sqrt{ 70.0877 } \\[1 em]|z| &= 8.3718 \\[1 em] \end{aligned} $$