apu-busn603-problem-set-6-100-score

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Part 1 of 2 – Part 1 40.0
Points

This part of the question is based on the following
information.

The Schmedley Discount Department Store has approximately
300 customers shopping in its store between 9 A.M. and 5 P.M. on Saturdays. In
deciding how many cash registers to keep open each Saturday, Schmedley’s
manager considers two factors: customer waiting time (and the associated
waiting cost) and the service costs of employing additional checkout clerks.
Checkout clerks are paid an average of $8 per hour. When only one is on duty,
the waiting time per customer is about 10 minutes (or hour); when two clerks
are on duty, the average checkout time is 6 minutes per person; 4 minutes when
three clerks are working; and 3 minutes when four clerks are on duty.

Schmedley’s management has conducted customer satisfaction
surveys and has been able to estimate that the store suffers approximately $10
in lost sales and goodwill for every hour of customer time spent waiting in
checkout lines.

Please fill out the following table to answer the quiz
questions in Part 1. (You may also download the attached worksheet.)

Number
of checkout clerks

1 2 3 4

Number of customers 300 300 300 300

Average waiting time (per customer)

Total customer waiting time

Cost per waiting hour

Total waiting cost

Checkout clerk hourly salary

Total pay of clerks for an 8-hour shift

Total expected cost

Attachments

603 Problem Set 6
Worksheet.xlsx

9 KB

Question 1 of 10 10.0
Points

The total customer waiting time is 50 hours when there is only one clerk, and it
will be reduced to only 15hours if there
are four clerks. (Please only enter an integer and include no units.)

Question 2 of 10 10.0
Points

The total wait cost is
500 dollars when there is only one clerk, and it will be reduced to
only 150 dollars if there are four
clerks. (Please only enter an integer and include no units.)

Question 3 of 10 10.0
Points

The total cost of hiring is only 64 dollars when there is only one clerk, and
it will be increased to 256 dollars if
there are four clerks. (Please only enter an integer and include no units.)

Question 4 of 10 10.0
Points

To minimize the total expected cost based on your
calculations above, the optimal number of clerks to have on duty each Sunday is
___________.

A.1

B.2

C.3

D.4

Part 2 of 2 – Part 2 60.0
Points

This part of the question is based on the following
information.

The wheat harvesting season in the American Midwest is
short, and most farmers deliver their truckloads of wheat to a giant central
storage bin within a two-week span. Because of this, wheat-filled trucks
waiting to unload and return to the fields have been known to back up for a
block at the receiving bin. The central bin is owned cooperatively, and it is
to every farmer’s benefit to make the unloading/storage process as efficient as
possible. The cost of grain deterioration caused by unloading delays, the cost
of truck rental, and idle driver time are significant concerns to the
cooperative members. Although farmers have difficulty quantifying crop damage,
it is easy to assign a waiting and unloading cost for truck and driver of $18
per hour. The storage bin is open and operated 16 hours per day, 7 days per
week, during the harvest season and is capable of unloading 35 trucks per hour
according to an exponential distribution. Full trucks arrive all day long
(during the hours the bin is open) at a rate of about 30 per hour, following a
Poisson pattern.

The cooperative, as mentioned, uses the storage bin only two
weeks per year. Farmers estimate that enlarging the bin would cut unloading
costs by 50% next year. It will cost $9,000 to do so during the off season.

Question 5 of 10 10.0
Points

The average number of trucks in the system is 6 trucks. (Please only enter an integer and
include no units.)

Question 6 of 10 10.0
Points

The average time per truck spent in the system is 12 minutes. (Please only enter an integer and
include no units.)

Question 7 of 10 10.0
Points

The utilization rate for the bin area is .86 . (Please round it to two decimal
points.)

Question 8 of 10 10.0
Points

The probability that there are more than 3 trucks in the
system is about .64 . (Please round it
to two decimal points.)

Question 9 of 10 10.0
Points

The total daily cost in the unloading process is 1486 per day. (Please only enter an integer
and include no units.)

Question 10 of 10 10.0
Points

Based on the above calculation, the net saving/loss of
enlarging the bin is 11805 dollars,
hence the cooperative should proceed to enlarge the bin. (Please round to an
integer and include no units. Use a “-” sign in front the number to
indicate a net loss, if there is a loss. Also, enter only “should” or
“should not” in the second blanket.)

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