00:01
Okay, so find the value of a union b.
00:05
So the union is equal to the probability of a plus the probability of b minus the probability of the overlap, the intersection.
00:20
So 12 plus 14 minus 5.
00:25
So the probability of a union b is 26 minus 5, 21.
00:40
So we're going to use that same formula for the next one.
00:46
So this one is 21.
00:51
So the next, same for the next one.
00:54
16 plus 28 minus 5.
01:03
So 16 plus 28.
01:07
Minus 5 is 39.
01:25
So we're going to work backwards on this next one using the same formula.
01:32
So the union is 25 equals 20 plus 12 minus a intersect b.
01:45
So that's going to be subtract 32 on both sides.
01:50
So that gives us negative 7 equals negative the intersection so the intersection equals seven okay the next one we're going to do it the exact same way we did the last one so 30 equals 20 plus 24 minus the intersection of the overlap so minus 44 on both sides so negative 14 equals negative a intersect b so it's going to be positive 14.
02:57
Find a, we're going to use the same formula, just plugging it in different.
03:02
So the union is 55 equals the probability of a plus the probability of b minus the overlap.
03:15
So we're going to subtract 20 on both sides, because that equals 20.
03:22
So 35 equals a, the probability of a.
03:30
So this is 35.
03:35
The last one will.
03:38
We're going to do it the same way.
03:41
So it says find the probability of b.
03:44
The union is 30 equals a is 20 plus b, which we don't know, minus the overlap, and the overlap is 6.
03:59
So we're going to set 20 minus 6 is 14.
04:01
So we're going to subtract 14 from both sides.
04:05
So that gives me 16 equals b.
04:10
Okay.
04:12
Now it says draw bin diagram to represent, use the given information.
04:20
Okay.
04:27
So 15.
04:31
So here's a.
04:34
Here is b.
04:38
So the overlap is 25.
04:41
The overlap goes here.
04:42
So that's 25.
04:48
Not a is 11...