00:01
Hi, i'm david and i'm here to help me answer your question.
00:03
Now let me bring up your question here.
00:06
A statistical analysis was done on the test scores for chemistry class.
00:13
Now in the question a, we are given that the median equal to the 80 and the mean equal to the 72.
00:27
Now with the two information here, it will try to scan the distribution.
00:32
Because the mean is bigger than the median.
00:35
So the graph will be something like this.
00:38
Where we have this will be the median and this will be some where it will be the mean.
00:46
And this one looks like will be the left skilled distribution and then you got it correct for this question a.
00:57
And now for the question b, suppose the highest and the lowest test score was removed from the set on the scores which on the falling would be the least affected the one would be have not affected it would be the mean the median because the highest and the lowest were removed and then the balance the data will be still the balance in the middle because after removing the lowest on the left and highest on the right the data is to balance at the middle.
02:22
And that's why we have this answer here must be the median.
02:29
And now for the question c, we will have if there is a total of the 30 exams and the third quantite has the value in 85, how many tests score are for certain 85 or greaterers.
02:52
Now let's try to list the value will be, it will be the value of the first test, the second test, the third one, up to the this one will be up to the 14, 15, 16 and then there will be the 30 here.
03:16
So let me put here x 14, x15, x16, and then up to the x30.
03:27
Now first of all, we will identify the median...