Use the data in the following table, which lists drive-thru order accuracy at po

Question

Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. If one order is selected, find the probability of getting food that is not from Restaurant A. The probability of getting food that is not from Restaurant A is...? Round to three decimal places please.


Restaurant A   Restaurant B   Restaurant C   Restaurant D
Order Accurate   340   276   233   138
Order Not Accurate   36   57   38   17

Explanation / Answer

Total restaurnat = 340 + 36 + 276 + 57 + 233 + 38 + 138 + 17 = 1135

P(Food not from restaurantt A) = 1 - P(food from restaurant A)

                                                  = 1 - (340 + 36) / 1135

                                                  = 1 - 0.331

                                                  = 0.669

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