Chapter 4, Problem 4.11P

Per capita expenditures for public transportation for 20 cities are reported here for 2000 and 2010. Compute the mean and standard deviation for each year, and describe the differences in expenditures for the ten-year period.

City	2000	2010
A	52	197
B	87	124
C	101	131
D	52	197
E	115	119
F	88	87
G	100	150
H	101	209
I	95	110
J	78	140
K	103	178
L	107	94
M	85	125
N	117	200
O	167	225
P	180	210
Q	120	201
R	78	141
S	55	248
T	92	131