Questions: In an apartment complex, 40% of residents read USA Today while only, 25% read the New York Times. Five percent of residents read both papers.

In an apartment complex, 40% of residents read USA Today while only, 25% read the New York Times. Five percent of residents read both papers.
Transcript text: In an apartment complex, $40 \%$ of residents read USA Today while only, $25 \%$ read the New York Times. Five percent of residents read both papers.
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Solution

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Fill in the missing values in the given table.

Identify the given probabilities.

  • Probability of reading USA Today (\( P(A) \)) = 0.40
  • Probability of reading New York Times (\( P(B) \)) = 0.25
  • Probability of reading both papers (\( P(A \cap B) \)) = 0.05

Calculate the probability of reading USA Today but not New York Times.

\( P(A \cap B^c) = P(A) - P(A \cap B) = 0.40 - 0.05 = 0.35 \)

Calculate the probability of reading New York Times but not USA Today.

\( P(B \cap A^c) = P(B) - P(A \cap B) = 0.25 - 0.05 = 0.20 \)

Calculate the probability of not reading either paper.

\( P(A^c \cap B^c) = 1 - P(A \cup B) = 1 - (P(A) + P(B) - P(A \cap B)) = 1 - (0.40 + 0.25 - 0.05) = 0.40 \)

Fill in the table with the calculated values.

\[ \begin{tabular}{|c|c|c|c|} \cline{2-4} \multicolumn{1}{c|}{} & \text{Reads NYT} & \begin{tabular}{c} \text{Does NOT} \\ \text{Read NYT} \end{tabular} & \text{Total} \\ \hline \text{Reads USA Today} & 0.05 & 0.35 & 0.40 \\ \hline \begin{tabular}{c} \text{Does NOT read} \\ \text{USA Today} \end{tabular} & 0.20 & 0.40 & 0.60 \\ \hline \text{Total} & 0.25 & 0.75 & 1 \\ \hline \end{tabular} \]

The completed table is: \[ \boxed{ \begin{tabular}{|c|c|c|c|} \cline{2-4} \multicolumn{1}{c|}{} & \text{Reads NYT} & \begin{tabular}{c} \text{Does NOT} \\ \text{Read NYT} \end{tabular} & \text{Total} \\ \hline \text{Reads USA Today} & 0.05 & 0.35 & 0.40 \\ \hline \begin{tabular}{c} \text{Does NOT read} \\ \text{USA Today} \end{tabular} & 0.20 & 0.40 & 0.60 \\ \hline \text{Total} & 0.25 & 0.75 & 1 \\ \hline \end{tabular} } \]

The completed table is: \[ \boxed{ \begin{tabular}{|c|c|c|c|} \cline{2-4} \multicolumn{1}{c|}{} & \text{Reads NYT} & \begin{tabular}{c} \text{Does NOT} \\ \text{Read NYT} \end{tabular} & \text{Total} \\ \hline \text{Reads USA Today} & 0.05 & 0.35 & 0.40 \\ \hline \begin{tabular}{c} \text{Does NOT read} \\ \text{USA Today} \end{tabular} & 0.20 & 0.40 & 0.60 \\ \hline \text{Total} & 0.25 & 0.75 & 1 \\ \hline \end{tabular} } \]

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