00:01
So what is the context here? the context is this is the day -by -day change in the dow jones industrial average during 10 successful days at the start of the financial crisis.
00:10
So i want to compute two different centers that i've talked about, the mean and the median.
00:14
How do i calculate the median? we'll recall the median is the middle value to calculate the median.
00:20
First, i have to list these numbers from least degrees.
00:22
So notice there's some negative.
00:23
So i first start with negative 500.
00:27
What's the next lowest value? maybe negative 300.
00:30
Negative 200, right? and then i have two, i also have another negative 200, two negative 100s, okay.
00:41
What's next? then i have two 200s, right? going from least to greatest, then a 400 and a 900.
00:47
Okay.
00:48
Once i list them from least to greatest, what i do is i find the middle number, so cross off a couple in each side until i get to the middle...