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You want to get from point X to point Y and then back to X. To...

You want to get from point X to point Y and then back to X. To get from X to Y there are 3 possible routes while to get from Y to X there are 4 possible routes. The time, in minutes, to travel each route are

Route

from x to y

from y to x

1

20

10

2

15

12

3

20

15

4

25

i) How many ways are there to complete the round trip?
ii) If the routes are chosen at random, both going and returning, find the pmf of the travel time

Math   Statistics-And-Probability   
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