00:01
So first, since we want to check the summary of the distribution of lifespans, we are going to focus on graph b, because graph b we have here in the x -axis, the life span.
00:16
And here we have the quantity or the frequency of observation.
00:22
So this will give us what is, in this case, the distribution of the lifespan.
00:28
Now we need to judge the following statements.
00:32
So basically the first one says that a typical lifespan for species in this group is 12 years or 15 years.
00:40
So typical here, when we say about a typical value, this is the same, in this case, to a central measure or tendency.
00:52
And we usually use the central measure as the mean or median.
00:58
For example.
01:00
So in our case, if you compute like the mean of this, which is basically like a sum, since we can see the specific value for each one of the 30 species that we have, we can just sum the lifespan of all these species and divide this by the total number of species that we are considering, which is 30.
01:22
So the mean here will be around 13.
01:25
And the median here will be like the observation.
01:29
Which divides the observations into like two groups.
01:34
50 % will be less than this amount of lifespan.
01:39
And 50 % would be more than a higher.
01:43
We have like a higher lifespan than this value.
01:46
So the median here for this distribution is 12...