00:01
So in this question, we have here the intervals, the clouds intervals, and we are missing one frequency.
00:11
And the information that they gave us is that the median is 309.
00:15
So we want to find the missing frequency.
00:19
So in this question, we have here the...
00:22
So to find this one, we use because the data is grouped, that the median is equal to, because the mid is 39, that means that the value is here in this class, because the 39 is within the zid.
00:40
Then that is the same as the lower limit for the median class plus the position of the number of observations over two minus how many observations we had prior to that class.
00:57
In this case, if you add these values together, we have 32, and we divide that by the frequency of the median class.
01:06
Then we multiply this one by the size of each class, which is 5 points.
01:12
Now with that, we can do 39 minus 35 is equals to n over 2 minus 32 over 11 times 5...