00:01
All right, so i see that you need help with this problem, and it says when women turn 40, their gynecologists usually remind them that it's time to undergo mammography screening for breast cancer.
00:12
The data in the table below are based on 100 ,000 women ages 40 to 50.
00:19
So this is based off of 100 ,000 women.
00:22
And so who participated in this screening.
00:26
So express probabilities as fractions and as decimals to the...
00:30
To three decimal places, find the probability that a woman age 40 to 50 has breast cancer.
00:40
So has breast cancer, so that would mean if i total up all of this, that's 800.
00:49
So for a, that is 800 out of 100 ,000.
00:58
And so 800 divided by 100 ,000 and that equals 0 .008.
01:11
Then b has a positive mammogram given that she does not have breast cancer.
01:21
So a positive mammogram but not breast cancer.
01:26
So 6 ,944 over 100 ,000.
01:35
That's 694 divided by 100 ,000.
01:41
Oops.
01:44
And that would be 0 .069.
01:53
Then c has a positive mammogrammy and breast cancer...