00:01
Okay, mariela earned the following test scores in math.
00:04
She had 95, 90, 100, 85, and 80.
00:06
This item's accident enter mario's next test score is a zero.
00:09
So we're going to look at these statements that are true.
00:12
First thing i want to do is i want to find, i've listed both sets of test scores in order from lowest to highest, and i want to find the mean of each case.
00:21
So for this one here, we're going to take 80 plus 85, plus 90, plus 95, plus 100.
00:27
We're not a space here.
00:28
And then divide that by the total number of tests, which is five.
00:33
So the mean before the error comes out to 90 when i divide that out.
00:37
My new mean, which i will just go ahead and scoot down here, give myself a little more space.
00:43
I'm going to take zero plus 80 plus 85 plus 90 plus 95 plus 100.
00:51
And that is now divided by six since there's six test scores.
00:56
Okay.
00:56
So i take that value and divide by six.
01:00
And i get a 75 for the mean.
01:08
So we already know that the median here is 90.
01:12
Actually, we don't know.
01:13
So we're going to find the median real quick.
01:15
So for the most to highest, we cross these off.
01:17
My median is 90.
01:19
After the error, we start crossing off again.
01:21
And we have two values here.
01:23
So i have to average those out for my median.
01:26
So we're going to do that.
01:27
And that's going to give me an 87 .5 for the median here...