00:01
So in this question, we need to give or say if the variable that we are considering is continuous or discrete, or even if it is a random variable.
00:16
So we have some.
00:17
So basically, for the first one, we are considering like the time that we have.
00:23
The time it takes, in this case, to drive from cta to c .d .b.
00:32
So basically, this is the variable that we have.
00:36
So as you can see, how can we say that something is like a random variable? it is usually when we need to, because like each people, in this case from cta that is going to citi b, they would like take a specific time.
00:52
Like if they are driving, in this case, like the velocity will depend on how fast a person will go from city a to c .b, which would depend on the person.
01:07
So to be able to estimate this, to be able to estimate the time, we should consider like a sample of people, right? so because of this, because we don't know for sure because depends on the people that is going from citi a to cid b, this means that this is a random variable that we can estimate the value.
01:26
And because we are talking about time, time is continuous, like in a weak sense.
01:31
We can have like one minute and, in this case, like 36 seconds.
01:37
We can have like one hour and 42 minutes and one second.
01:44
So as you can see, we have like in this case it's not like a whole number, like a one hour, two hours.
01:51
Two hours or something like this or like a number of babies one baby two babies or something like this here is not a whole number so because of this this variable is continuous so the right answer for this first one will be letter b for letter in this case for the second variable that we are considering is the last book a person city a read in this case so basically they are talking about a specific person here and the last book.
02:22
So book is not quantity.
02:24
It's like a label.
02:25
Like, oh, my last book, the last book that i read was this one.
02:29
So it's like a label.
02:30
So could not be discrete or even like continuous.
02:34
And we like we are talking about specific person, like maybe like the professor in like a university or something like this, my friend.
02:42
So because of this, like we just need to ask that person, like which book was the last one that you were.
02:49
So because it is not continuous, because it is just a label, and it's not discrete because of the same reason, this means that for this variable, the right answer will be that this is not a random variable.
03:02
Now, for the third variable that we have, we are considered the number of homie runs in a baseball game.
03:12
So, usually to be able to say this, we should go to like a lot of baseball games.
03:21
And we need to, in this case, check, like, how many home runs we had in that game.
03:27
And then we'll be able, like, afterwards to say the average, like the average number of home runs in a baseball game is this one.
03:38
And home runs is discrete...