91Ó°ÊÓ

The given data shows the number of food orders from four different outlets under two categories, accurate order and inaccurate order.

The probability of an event is computed using the given formula:

$P\left(E\right)=\frac{\text{Number}\text{of}\text{favorable}\text{outcomes}}{\text{Total}\text{number}\text{of}\text{outcomes}}$

Its value ranges from 0 to 1.

The table below shows all the required subtotals and grand total for calculation of probability.

Let A be the event of getting food that is not from ²Ñ³¦¶Ù´Ç²Ô²¹±ô»å’s.

The total number of food orders that are not from ²Ñ³¦¶Ù´Ç²Ô²¹±ô»å’s can be denoted as $\stackrel{¯}{m}$.

The value is computed below as:

$$\begin{gathered} \stackrel{¯}{m}=318+280+158 \\ =756 \end{gathered}$$

Let the total number of orders be denoted by N.

The probability of getting food that is not from ²Ñ³¦¶Ù´Ç²Ô²¹±ô»å’s is given as:

$$\begin{gathered} P\left(A\right)=\frac{\stackrel{¯}{m}}{N} \\ =\frac{756}{1118} \\ =0.676208 \end{gathered}$$

Therefore, the probability of getting food that is not from ²Ñ³¦¶Ù´Ç²Ô²¹±ô»å’s is 0.676.