00:02
For part a, we want to make a frequency table and a relative frequency table.
00:07
So i've already created my frequency part of the table, 60 in class a, 36 in class b, and 24 in class c.
00:15
And then the relative frequency is just a fancy word for the proportion or the percentage of people that are in each class.
00:22
So for the first class, class a, 60 out of 120 is 50%, or 0 .50.
00:29
0.
00:31
And then 36 out of 120 gives us a relative frequency of 0 .30.
00:38
And then 24 out of 120 is 20 % or 0 .20.
00:43
And notice that those relative frequencies add up to 1.
00:48
Now that'll help us in question b.
00:52
So now we're given four classes and the relative frequency of three of them.
00:58
So to find the relative frequency of the fourth one, we're going to do one minus .24, one minus point 24 minus .06 minus .4, which gives us a relative frequency of .30.
01:15
And then the next part says we want to know what the frequencies are if there was a class of 200.
01:22
So i'm going to build my frequency table this way...