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Softa [21]
1 year ago
6

I need help trying to understand how they solved this equation. Just a little confused.

Mathematics
1 answer:
Misha Larkins [42]1 year ago
3 0

Answer:

0.495

Explanation:

Given the expression:

0.55-1.645\sqrt[]{\frac{0.55(1-0.55)}{220}}

Begin by simplifying the expression under the radical (square root) sign.

\begin{gathered} =0.55-1.645\sqrt[]{\frac{0.55(0.45)}{220}} \\ =0.55-1.645\sqrt[]{\frac{0.2475}{220}} \end{gathered}

Using a calculator, we evaluate the radical:

\begin{gathered} =0.55-1.645\sqrt[]{0.001125} \\ =0.494825 \\ \approx0.495\text{ (to 3 decimal places)} \end{gathered}

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