Question

Use the data in the following table, which lists drive thru onder accuracy at popular fast food chairs. Assume that orders are randomly selected from those noluded in the table. Drive-thru Restaurant А B c D Order Accurate 323 273 247 140 Order Not Accurate 36 60 31 19 Wone 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 dit events? The probability of getting an order from Restaurant or an order that is not accurate is (Round to three decimal places as needed) Are the events of selecting an order from Restaurant and selecting an accurate ander din events? The events sijoint because a posible to

Answer 1

the necessary calculation table :-

	A	B	C	D	row total
order accurate	323	273	247	149	992
order not accurate	36	60	31	19	146
column total	359	333	278	168	1138

a).the probability of getting an order from Restaurant C or an order is not accurate is :-

= number of orders from restaurant C + number of orders that are not accurate - number of orders from restaurant C that are not accurate / total number of orders

$=\frac{278+146-31}{1138}$

$=\frac{393}{1138}$

$\approx \mathbf{0.345}$

b). the events are not disjoint because it is possible to select an inaccurate order from restaurant C.

[ number of orders from restaurant C that are not accurate = 31 ]

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