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Asked Dec 21, 2019
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In Exercises 9–20, use the data in the following table, which lists drive-thru order accuracy at popular fast food chains (data from a QSR Drive-Thru Study). Assume that orders are randomly selected from those included in the table.

Fast Food Drive-Thru Accuracy If one order is selected, find the probability of getting an order from McDonald’s or Wendy’s or an order that is not accurate.

McDonald's Burger King
Wendy's
Taco Bell
Order Accurate
329
264
249
145
Order Not Accurate
33
54
31
13
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McDonald's Burger King Wendy's Taco Bell Order Accurate 329 264 249 145 Order Not Accurate 33 54 31 13

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Expert Answer

Step 1

Definition:

Two events are independent, if the probability that one event occurs not affect the other event occurring.

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

Step 2
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From the given data, Wendy's Taco Bell Total Burger King Mc Donald Order 329 249 145 987 264 |accurate Order not 33 54 31 13 131 accurate total 362 158 1118 318 280

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Step 3
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We know that 362+280 = 642 orders are from McDonald's. no.of favevents total no.of events P (McDonald's or wendy's) 642 1118 131 are not accurate no.of favevents total no.of events Р (поt acсurate) 131 1118

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