We need to calculate probabilities with the data in the table.
What is the probability that someone chosen at random was aged 41-50?
[tex]\text{prob}=\frac{succes\text{s cases}}{total\text{ cases}}=\frac{1459}{3742}\approx0.39[/tex]The probability is 39%.
What is the probability that someone chosen at random was an Android user or aged 41-50?
[tex]\begin{gathered} \text{prob}=\frac{success\text{ cases}}{total\text{ cases}}=\frac{1459+2160-1068}{3742} \\ \text{prob}=\frac{2551}{3742}\approx0.682 \end{gathered}[/tex]The probability is 68.2%.
What is the probability that someone being aged 41-50 and an Android user?
[tex]\text{prob}=\frac{success\text{ cases}}{total\text{ cases}}=\frac{1068}{3742}\approx0.285[/tex]The probability is 28.5%.
Given a random person was aged 18-30, what is the probability that they were and iPhone user?
[tex]\text{prob}=\frac{success\text{ cases}}{total\text{ cases}}=\frac{653}{1058}=0.617[/tex]The probability is 61.7 %.