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	327	278	241	125
Order Not Accurate	33	59	31	10

If one order is​ selected, find the probability of getting an order that is not accurate or is from Restaurant C. Are the events of selecting an order that is not accurate and selecting an order from Restaurant C disjoint​ events?

The probability of getting an order from Restaurant C or an order that is not accurate is

nothing.

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

Are the events of selecting an order from Restaurant C and selecting an inaccurate order disjoint​ events?

The events

▼

are

are not

disjoint because it

▼

is not

is

possible to

▼

receive an inaccurate order from Restaurant C.

pick an accurate order.

pick an order from Restaurant A, B, or D.

Answer 1

Total no. of orders = 33+59+31+10+327+278+241+125 = 1104.
No. of orders that is not accurate = 33+59+31+10 = 133.
No. of orders that is from Restaurant C = 241+31 = 272.
No. of orders that is not accurate and from Restaurant C = 31.
Probability of getting an order from Restaurant C or an order that is not accurate = (133+272-31)/1104 = 0.339.

Are the events of selecting an order from Restaurant C and selecting an inaccurate order disjoint​ events? The events are not disjoint because it is possible to receive an inaccurate order from Restaurant C.