00:01
We have a frequency table, so we can see what grades people got.
00:05
A, b, c, d or f, and their frequencies.
00:10
9 -1 -0 -0 -1.
00:14
So for question one, we pick somebody at random.
00:17
What is the probability they received a d grade? well, nobody received that grade, so the probability is zero.
00:25
Zero means impossible to happen.
00:29
Part two.
00:30
C or above is a pass.
00:32
If we pick one at random, what is the probability they passed? so i'm going to make a fraction here.
00:38
I can see we have 11 students in total, so each student has a 1 in 11 chance of being chosen here.
00:45
So on the numerator, i'm going to put the 10 students that meet my criteria.
00:49
Because the probability of picking one of these students is 10 in 11, or as a decimal, 0 .9091, to 4 decimal places...