00:01
Okay, we are told the chance of snow this week is 0 .30, which means here is 0 .3.
00:09
And that implies 0 .7 must go here.
00:13
For all three diagrams, every branch must add up to given 1.
00:18
So, if it snows this week, so we're on this branch here, then the chance it snows next week is 0 .39.
00:28
So snow again, 0 .39 chance, which implies no snow, 1 minus that, 0 .61.
00:41
Again, 1 in total.
00:45
Now, if it doesn't snow, then next week is down to 0 .21.
00:51
So here then, i'll snow, and no snow is 0 .21, which implies no snow, 1 minus that, 0 .79.
01:05
That tree diagram shows all possible outcomes.
01:12
Now, if i want to work out the chance, it will snow next week...