Question

Please show calculations:

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	338338	279279	248248	140140
Order Not Accurate	3535	5757	3434	1717

If one order is​ selected, find the probability of getting an order from Restaurant A or an order that is accurate. Are the events of selecting an order from Restaurant A and selecting an accurate order disjoint​ events?

The probability of getting an order from Restaurant A or an order that is accurate is

nothing.

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

Are the events of selecting an order from Restaurant A and selecting an accurate order disjoint​ events?

The events

▼

are not

are

disjoint because it

▼

is

is not

possible to

▼

receive an accurate order from Restaurant A.

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

pick an inaccurate order.

Answer 1

Total order = 338 + 279 + 248 + 140 + 35 + 57 + 34 + 17 = 1148

P(order from restaurant A or accurate) = P(order from restaurant A) + P(accurate order) - P(order from restaurant A and accurate)

                                                              = (338 + 35) / 1148 + (338 + 279 + 248 + 140) / 1148 - 338 / 1148

                                                              = 0.906

The events are not disjoint because it is possible to receive an accurate order from restaurant A.