Question
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 an order that is accurate. Are the events of selecting an order from McDonald’s and selecting an accurate order disjoint events?

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

Computing the probability of getting an order from Restaurant A or an order that is accurate:

Event A is defined as getting an order from restaurant A and B is defined as getting order that is accurate.

Addition rule for two events:

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Step 2

The probability of any event A is given below:

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Number of outcomes in A P(A)= Total number of outcomes in the sample space

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Step 3

The probability of getting an order f...

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329 +33 P(A): 329 + 33 + 264 +54 +249 +31+145 +13 362 1,118 = 0.324

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