00:01
Okay, for this question, you've been given a table of information.
00:05
We have the grades that people earned, a, b and c, and gender, male or female.
00:12
And we can see that for males, there were 20 a's, 8 b's, 10 c's.
00:20
For females, 16 a's, 18 b's and 9 c's.
00:25
Okay, for a total of 38 male participants, 43, and you've got the total.
00:31
Totals along here, for the number of people who got different grades, and then just the total number of students.
00:38
We are picking a student completely at random.
00:41
What this means is every student has an equal probability of being chosen.
00:45
We want the probability they are not female and did not get a c.
00:50
So the easiest way to approach this is to make a fraction where you have all 81 people on the denominator, because each person has a 1 in 81 chance of being chosen.
01:01
And then you put the ones who meet your criteria on the numerator...