probability of A or B 4.2.17 Question-Help i Use the data in the following table

Question

probability of A or B

4.2.17 Question-Help i 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 Drive-thru Restaurant D Order Accurate 318 277 233144 Order Not Accurate ! 31 | 50 | 38 | 1/- if one order is selected find the probability of getting an order from restaurant B or D or an order that is not accurate The probability of getting an order from restaurant B or D or an order that is not accurate is Round to three decimal places as needed

Explanation / Answer

Total orders = 1108

P(B or D or order not accurate) = P(B) + P(D) + P(order not accurate) - P(B and D) - P(D and order not accurate) - P(order not accurate and B) + P(B and D and order not accurate)

= 327/1108 + 161/1108 + 136/1108 - 0 - 17/1108 - 50/1108 + 0

= 0.503

P(A or B) = P(A) + P(B) - P(A and B)

                = 349/1108 + 327/1108 - 0

                = 0.610

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