00:01
We've been given a lot of information here.
00:03
Let's start by explaining what it all means.
00:06
So we have the mean.
00:09
The mean is where you take every data point, add all of them up, and divide by the number of pieces of data.
00:16
So it's an average.
00:17
The mode is just the most frequent piece of data.
00:23
Whatever value came up the most times.
00:26
In this case, there's only one value that came up the most times.
00:29
It is possible to have two modes.
00:31
If you have two popular pieces of data that came up the same number of times, no modes if they all came up the same times, maybe once.
00:41
The standard deviation is a measure of spread rather than centre.
00:47
It's where you take each data point, you subtract the mean, mu, you square the difference, you add them all up, you divide by the number of pieces of data, and you square root them.
00:58
Complicated, but effectively the average difference between data points and the mean.
01:05
So it tells you how to spread out the data is.
01:08
The median is the midpoint.
01:13
It's the 50th percentile.
01:19
It means half of the data values are below it, half are above it.
01:24
The first quartile, p1, is the 25th percentile, a quarter below, three quarters above, third quartile is the 75th percentile, three quarters below, one quarter above.
01:37
So p86, is the 86 % percentile.
01:42
86 % of values are below this point, 14 % or above.
01:48
Now we have this.
01:50
Let's go forward and answer the questions.
01:55
What is the most common weight? well, that's going to be the mood...