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.

	​Drive-thru Restaurant
	A	B	C	D
Order Accurate	314314	274274	243243	144144
Order Not Accurate	3131	5353	3636	2020

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

nothing.

​(Round to three decimal places as​ needed.)

Answer 1

	Drive thru Restaurant
	A	B	C	D	Total
Order Accurate	314	274	243	144	975
Order Not Accurate	31	53	36	20	140
Total	345	327	279	164	1115

The total number of people who made the order = 1115

The number of people who made order from Restaurant A = 314 + 31 = 345

Probability of getting food from Restaurant A= 345 / 1115 = 0.309

Now

The probability of getting food that is not from Restaurant A

= 1 - Probability of getting food from Restaurant A

= 1 - 0.309

= 0.691

The probability of getting food that is not from Restaurant A is 0.691.