Atrade magazine routinely checks the drive-through service times of fast-food restaurants. upper aa 9090% confidence interval that results from examining 503503 customers in one fast-food chain's drive-through has a lower bound of 168.7168.7 seconds and an upper bound of 171.7171.7 seconds. what does this mean? choose the correct answer below. a. the mean drive-through service time of this fast-food chain is nothing seconds nothing% of the time. b. one can be nothing% confident that the mean drive-through service time of this fast-food chain is nothing seconds. c. there is a nothing% probability that the mean drive-through service time of this fast-food chain is between nothing seconds and nothing seconds. d. one can be 9090% confident that the mean drive-through service time of this fast-food chain is between 168.7168.7 seconds and 171.1171.1 seconds.

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution

Carla was trying to decide what to do saturday evening. she has $100 available to spend for the evening. she has narrowed her choices down to these events: braves game, a concert of an artist she likes, or the georgia aquarium. admission to the braves game is $25, hot dogs cost $10, sodas cost $5. the concert costs $25 for admission, $20 for a souvernir t-shirt, and $10 for a soda. the georgia aquarium has the show of a lifetime with an all you can eat and drink that costs $100. carla does not want to take any driving chances, so in addition to the cost of the aquarium, she will also need to pay for her uber/lyft, which is $15 each way. which option should carla choose if she wants to spend the least? based on that choice, what then is carla's oppotunity cost? fully explain your answer in at least one paragraph.

Apack of gum would be considered a(n) necessity luxury item small ticket item unaccountable expense