For problems 2 and 3, use the following table, which lists drive-thru order accu
ID: 3048793 • Letter: F
Question
For problems 2 and 3, use the following table, which lists drive-thru order accuracy at popular fast food chains (data from a QSR Drive-Thru Study
McDonald’s
Burger King
Wendy’s
Taco Bell
Accurate Order
329
264
249
145
Order Not Accurate
33
54
31
13
2. If one order is selected, find the probability of getting an order that is not accurate.
Answer: ______________
3. If an order is selected, find the probability of getting an order from McDonald’s or Wendy’s or an order that is not accurate.
Answer: ______________
4. Find the probability that when a couple has three children, at least one of them is a girl. (Assume that boys and girls are equally likely.)
Answer: ___________________
5. In a recent year, there were 333 murders in New York City. Find the mean number of murders per day, then use that result to find the probability that in a day, there are no murders. (Use a Poisson Distribution)
Answer: ___________________
6. Assume p = 0.45. Find the probability that at least 10 of 15 guests participated in fire drills. (Use a Binomial Distribution)
Answer: ___________________
McDonald’s
Burger King
Wendy’s
Taco Bell
Accurate Order
329
264
249
145
Order Not Accurate
33
54
31
13
Explanation / Answer
2) probability of getting an order that is not accurate. = (33+54+31+13)/(33+54+31+13+329+264+249+145)
= 0.1172
3) probability of getting an order from McDonald’s or Wendy’s or an order that is not accurate. =
(33+54+31+13+329+249)/(33+54+31+13+329+264+249+145)
= 0.6342
4) P( At least one girl) = 7/8
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