00:01
For part one, we have 10 people on the day shift, eight on a swing shift, and six on a graveyard shift.
00:13
So if i add those all together, i have 24 workers total, and we're trying to choose six.
00:22
So my probability that all six are going to be on the day shift, i have 10 i'm choosing from, and i'm trying to choose six.
00:32
Then my probability for all my workers, 24 total workers choose six.
00:39
So i'll get 210 possibilities over 134 ,000 596 possibilities, or a probability of 0 .0016.
00:53
For the probability that they all come from the same shift, we just found out the day shift, so 10 choose 6 over 24, choose six.
01:08
That's for the day shift.
01:11
For the swing shift, i have eight possible people i'm choosing from.
01:19
And then for the graveyard, i have six possible people people i'm choosing from.
01:30
So if i add those together, i'll have 210 plus 28 plus 1, all over 134 ,000, 569, or a probability of 0 .0018.
01:49
The probability of at least two different shifts, which is basically saying the probability of at least one different because if one shift is different, the others have to be different from that.
02:19
That's going to be one minus the probability that they're all the same.
02:25
And we just found out the probability of them all the same is 0 .0018.
02:31
So our probability then if we subtract is 0 .9982.
02:40
For the second part of this problem, talking about lyme disease, i know that 18 % of people have lyme, 6 % have hde, and 6 % have both.
03:02
So the probability of having lyme given you have h .e.
03:13
We just found out that we're given the probability of lyme is 0 .18.
03:17
The probability of h .d.
03:22
Is 0 .06.
03:24
And then the probability of lyme or h .e is going to be the probability of h .g .e.
03:40
Times the probability of having both.
03:48
So we're going to use that to try to solve the probability.
03:56
So i'm going to rewrite this as the probability of lyme and h .e equals probability of lyme plus probability of h .d.
04:11
Minus probability of lyme or h .e.
04:21
So i know the probability of lyme is 0 .18, probability of h .e.
04:29
0 .6 times probability, rewriting it from up here, times probability, 06, times probability of lyme or, excuse me, and hge...