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Hello what is the probability of NOT getting from A

Hello what is the probability of NOT getting from A-example-1
User IAj
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From the table presented in the question, we can conclude that the total number of orders is equal to:


\begin{gathered} N=(334+34)+(272+60)+(248+32)+(123+20) \\ N=368+332+280+143 \\ N=1123 \end{gathered}

The number among them which are from restaurant A is equal to 368. It means that the number of orders which are NOT from A is equal to 755. From this, we can calculate the ratio of the number of orders which are not from A by the total number of orders:


r=(755)/(1123)\cong0.672

From this, we can say that if an order is picked randomly from those in the table, the probability it is NOT from A is equal to 0.672.

User Mauretto
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