Which city has a greater third quartile?
a: city a
b: city b
c: both third quartiles are the same
d: there is not enough info provided.

They are the same.

Step-by-step explanation:

Since the plot shows 61 the mean and 73 the upper percentile of the box, then the 3rd quartile (the middle of the upper data grid/sector) must be the same in both cities.

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)