Starting at a fixed time each car entering an intersection i

Starting at a fixed time, each car entering an intersection is observed to see whether it turns left (L), right (R), or goes straight ahead (A). The experiment terminates as soon as a car is observed to turn left. Let X = the number of cars observed. What are possible X values?

0, 1, 2, 3, ... 1, 2, 3, 4, ...     0, 1, 2, 3, 4 1, 2, 3

Given the outcomes below, find their associated X values.

Solution

possibles X values are infinitive because you dont know with anticipation which cars will turn left

0,1,2,3,4,5,6,......

for the table

X

AARL ---------------- 4

RARRL-------------5

RRAL--------------4

RRL------------3

RRRRL-------------5