Approximate the following number using a calculator. \( 8^{-1.8} \) \( 8^{-1.8} \approx \square \) (Round to three decimal places as needed.)

First, let's break down the calculation for \( 8^{-1.8} \). This can be rewritten as \( \frac{1}{8^{1.8}} \). Using the calculator, first compute \( 8^{1.8} \), which gives approximately \( 36.566 \). Therefore, taking the reciprocal results in \( 8^{-1.8} \approx \frac{1}{36.566} \approx 0.0274 \). Rounding it to three decimal places gives us \( 0.027 \). So, \( 8^{-1.8} \approx 0.027 \).