A larger and more modern main post office is to be constructed at a new location
ID: 378378 • Letter: A
Question
A larger and more modern main post office is to be constructed at a new location in Davis, California. Growing suburbs caused a shift in the population density from where it was 40 years ago, when the current facility was built. Annette Werk, the postmaster, asked her assistants to draw a grid map of the seven points where mail is picked up and delivered in bulk. The coordinates and trips per day to and from the seven mail source points and the current main post office, M, are shown in the following table. M will continue to act as a mail source point after relocation.
Mail Source Point
Round trips per day
x, y, Coordinates (miles)
1
7
(15,4)
2
6
(2,12)
3
1
(17,10)
4
16
(2,9)
5
7
(3,6)
6
1
(5,11)
7
8
(7,17)
M
7
(1,4)
a. Calculate the center of gravity as a possible location for the new facility. (Enter your responses rounded to the nearest whole number.)
The center of gravity "X" coordinate = ______
The center of gravity "Y" coordinate = ______
Enter your answer in the edit fields and then click Check Answer.
Mail Source Point
Round trips per day
x, y, Coordinates (miles)
1
7
(15,4)
2
6
(2,12)
3
1
(17,10)
4
16
(2,9)
5
7
(3,6)
6
1
(5,11)
7
8
(7,17)
M
7
(1,4)
Explanation / Answer
By C.G. method
Cx = X1V1 +X2V2+.....+XnVn / V1+V2 +...Vn
Cy = Y1V1+Y2V2+....+YnVn / V1+V2+...Vn
Cx = 15x7+2x6+17x1+2x16+3x7+5x1+7x8+1x7 /53
= 4.81
Cy = 4x7+12x6+10x1+9x16+6x7+11x1+17x8+4x7 /53
= 471/53 =8.88
Hence the point is (4.81,8.88)
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.