Statistika (3) - Membaca Penyajian Data, Diagram Lingkaran, Diagram Batang - Matematika SMP

Hello friends, see you again with me on the channel Legur Les. In this video, we will continue our study about statistics. In the previous video, we have learned about how to present data. We have also learned about what is population and sample. In this video, we will learn how to read a data presentation and also interpret the data. Don't forget to subscribe to the Legur Les channel. The subscribe button is on the bottom right.

Well, reading and interpreting data are two things related to reading, usually related to reading the data of a statistic, for example, we want to read the circle diagram, the bar diagram, the line diagram, then we will talk or study the number of numbers or statistical values related to the data. For example, we are looking for the number of

certain number from which month to which month the highest number the lowest number, yes, if the data is explained, it gives a certain conclusion about a data, of course the conclusion must be empirical, yes, there must be numbers and not subjective, so it can't be the conclusion later, oh, from the data, the conclusion is

more beautiful or more pleasing, well that can't be concluded because there is no size and value more beautiful or more pleasing. Well, we will learn about how to read the graph, line diagram, bar diagram, table, and later circle diagram.

The first question is the data of the level of the student's father in the performance school. Based on the data below, we are told to determine the number of students in the performance school. This is very easy. So if this is the number of fathers, the father's frequency that is the same as the elementary school, the father's frequency that is the same as the junior high school, and so on. Then for the number of students,

We just have to count it, I don't count orphans, so all students are considered to have a father. So we just have to count it, 8 + 14 + 98 + 56 + 23. This is 22, this is counted as 154 + 23, this is the number.

199 so the number of students turns out to be 199 children then the question B how many fathers have minimal education SMA, this is minimal SMA, it means that the SMA must be included, yes, minimal SMA

D3 and Sarjana if the question is higher than SMA, it means the SMA does not follow or maximum highest SMA, so later SD, SMP, SMA so for question B, we just need to sum up the answer is 98 plus 56 plus 23 98 plus 56 154 plus 23 177

father, whose education is minimalism. So it's still easy, it's just reading. Well, this is what often comes out, things like this. This brother here has a circle diagram. Here is the student data that takes extra-curricular at Ijuk Prestasi School. Based on this data, determine the percentage of students who take futsal

The questions B and C are not related, so the numbers must be different. Then if we see a question like this, we want to calculate the percentage. So later there can be two appearances. The appearance in the form of a percentage or the appearance in the form of a degree. If the percentage is 100%,

It means if we want to calculate the futsal part, it's really easy. Just 100% minus this 24% minus 16% minus 21% minus 10%. This is 100% minus 71% so that the result is

29% so the percentage of students who follow the extra-curricular futsal is 29% we get it from here we calculate it just reduce the percentage for question B if it turns out like this the total number of students is 200 how many will follow futsal in total we will use it as a comparison so later the question

per what is known multiplied by the known frequency. Now, the question is, right? The one that follows the futsal, it is 29%. Divided by what is known is the total students, which means all of them.

that is 100% multiplied by the known frequency, all frequencies are 200, this can be corrected, this becomes 2, then 29 multiplied by 2, the result is 58 children. So try it, so the format is like we learn the comparison in class 7.

This means for question C, the one that follows PMR is the one that is asked, per the known, multiplied by the known frequency. The one that is asked is PMR. PMR is 24%. Divided by the basket. The basket is 16%. multiplied by the known frequency, which is the basket frequency, 10 people. We can sort this out.

this divided by 8, divided by 8, so 3 divided by 2, multiplied by 10, this divided by 2, 5, this becomes 15 children. So it's like that, so it's very easy, it's easy to find others. You don't have to find all the children, so if it's about C, there's also a teacher who says, "Well, you find all the students first, then find others." You don't have to, we can directly compare.

Let's try another example, this is the result of the selection of the head of the Oasis in the Ijuk Prestasi school. There are Sandy, Daddy, Budi, and Ali. If we look at it, it turns out that the degrees are different. For the Daddy, because we use degrees here, we have to know how many degrees it is. How? Because we are circular, the circle is 360 degrees.

we just need to subtract with what we know 90 - 70 - 80 then this is 360 - we add 90 + 70 + 80 - 240 degrees so this is 120 degrees without counting the number of voices from this diagram

we can know the winner is the biggest one, which is Deddy. So, without counting, we just have to see, "Oh, this is the biggest one, so the chosen one is Deddy." For B, we are told to determine the number of each sound. For example, for Deddy, the same as the one asked, per the known times the known frequency.

The question is about the Dedy, which is 120 degrees divided by the known one, the choice means everything, all the voices, that is, multiplied by 360 degrees multiplied by the known frequency 180, we can sort this out

So it's 2, and then we subtract it, and it's 60. Oh, it turns out that the one who chose Deddy was 60 people. We can also calculate the other one. We can calculate Sandy. The degree is 90, per what we know is 360 times 180. We subtract it, and it's 2. 90 divided by 2, the result is 45 people. Now we calculate Budi.

we see this is 70, so this is 70/360, or the total is all, multiplied by 180, this can be divided into two, 70 divided by 2, 35 people. Now for the other, you can reduce it from the total voice or we also count 80/360 multiplied by 180, the same process, later you get 40 people.

So if we know the degree, we can calculate any one. It means we want to calculate the b, yes the c. The c is not related to the a, so the numbers are different. Who chooses Sandy? Sandy is 90, right? So Sandy is what is asked, per what is known, multiplied by the known frequency.

the question is 90, the known is Budi 70 degrees times 21 this can be counted by voice, divided by 10 21 divided by 7 is 3, 9 divided by 3 is 27 people so the chosen is 27 people, roughly like that, if asked to calculate the total voice

Remember, B and C are different because total sound means what we are asked for. We can use Sandy's voice or Budi's voice. What we are asked for is all of them. 360 divided by, for example, you use Budi's voice too, so it's 70. Budi's voice is 70 multiplied by Budi's frequency which is 21. We can subtract the zero. We subtract it to 3. 21 divided by 7 is 3.

36 x 3 = 108 people 36 x 3 So it's easy, if we know all of the angles To find one or all of them, we just need to compare Now the fourth example, this is a fairly easy example We will read the line diagram

This is the movement of the exchange rate of rupiah to the dollar in a week. When is the lowest? Oh, it's easy, we just have to see from this graphic which one is the lowest. Oh, the lowest is the day, which means the lowest is Tuesday. If the highest, the highest is the highest, which means Thursday.

Now, this B, which sometimes we still have to study a little, is asked when is the biggest decline. So we have to find out how many decreases there are. Oh, it turns out from Monday to Thursday there was a decrease. How much is the decrease? Just look at it. 13500 to 13200. Oh, 300 points.

I'm again, the one that goes down, oh from Thursday, eh this is Tuesday, sorry Monday becomes Tuesday, it goes down 300 Thursday becomes Friday, it goes down 1450 to 13850, just reduce the result 200 points, which means the biggest decline happens on Tuesday

not on Monday, but on Tuesday compared to the previous day it dropped the most let's try the fifth question here we are asked to calculate the price based on the egg graph on the side guess the price of the egg on the fifth week we just have to guess this is impossible the answer is Rp. 17,000 because it dropped, it is impossible Rp. 16,500 it is impossible Rp. 14,000, it is impossible below

This one is still below 15000. If we draw a line, it's still below this. It means, this is a big possibility or almost certain if from the choice, it is 15500. Easy. Let's try this question. We have started to interpret the data. This is the weight of the baby's body compared to the criteria of a healthy child. So the one above this,

this is the criteria for healthy children, this is the child's sister, yes, if we look here, the first question is the average weight of the child's body in the last three months, yes, it means the month 8, the month 17, the month 16, we play a little bit about the average

We haven't learned it yet, in the video that my brother hasn't given, if you watch it in order, the average is the number of values divided by the number of data. The last 3 months the data is the values ​​10.4, 10 and 11. So we just enter it, 10.4 plus 10 plus 11 divided by the number of data is 3.

Well, the result of 10 plus this means 31.4 divided by 3, the result is 10.47. Now, this is using rounding, where is it from, bro? Only 314 divided by 3, 1, 3, 0, 0, this is 1, you can't divide it, then the 4 goes down, 14 means

4, 12, minus this 20, 6, 18, and then 66 again. But remember we have 1 here, there is a comma here. 10.47. That is the average weight of the last 3 months of the baby's body. Based on the graph, what does this include? Very healthy.

enough or not healthy, right? Actually, if we look at it, maybe, well, this is a little bit, you should give a reference, yes, if it's very healthy, how big is it above? How big is it above the line? Is it enough when it's on the line?

If it's unhealthy, it means it's below the line. So if we look at it here, the conclusion is that the younger brother is a non-healthy or unhealthy child. If it's enough, it's on the line. Or if it's enough, it's on the line a little bit. Well, here, you don't give the limit of how unhealthy it is, where the enough is if the average is how much and so on. But in the meantime, we can conclude that he is unhealthy. You should give a more specific question.

Let's try the seventh question. Here is the average data of the 7A and 7B class. This is 7A, the math is 7.1, the IPA is 7.2, the grammar is 7.8, the IPS is 6.9. Here it is said that the average value of 7A is not better than 7B class. If it's not better, it means it's below or the same. But if we look at it,

This is a double choice, Class 7A is above, in terms of value it is above 7.1, even though the difference is 0.1, but from the data it is concluded that it is better than Class 7B, so this is not it. The lowest average IPS value? This is not explained, the average IPS, in general or how? But if we look at it, yes, if it is 7A, it is the lowest.

But if it's 7B, it's not the lowest, the lowest is Math. So this is also not. This is the value of C and D that may be correct, but we need to find the real value. So we want to find this, for C we want to find the average, or we want to sum it up first. We make a column of numbers,

7.1 + 7.2 + 7.8 + 6.9 if the result is 29 the bottom we also add 70 + 7.5 + 7.3 + 7.4 the result is 29.2 higher B a little bit means if we look for an average of 7a

this is 29, the number of values ​​divided by the number of data, 1, 2, 3, 4 divided by 4, 29 divided by 4 is 7.25, then if the average is 7B, this is 29.2 divided by 4, this is definitely higher, the result is

7.3 so if we look at the average value of A, 7A is better than 7B, no, it's lower, it's 72.9 the number of 7B values ​​is higher than the number of 7A class values ​​so this is correct, so it's a calculation even though it's a little better, it's only 0.2 but the way of value is better, it can't be misplaced if the statistics are

Yes, now let's try the example of the eighth question. Well, this is the graph of the value of the positive repetition in five repetitions. Well, here we are told to determine what we can conclude. There are four choices. Is mathematical repetition easier? Let's try the impossible first.

Maths is easier Maths is easier than Physics This is very subjective, right? Easier for Ijup? Maybe not, we don't know Actually maybe he feels the physics is easy, just miscalculated, for example, it can be like that Ijup likes to study Maths better, what else is this? Impossible

He likes this one better. Because "like" doesn't have a size. The value doesn't mean he doesn't like it. It can be that he doesn't like both of them. The value is not very good. For example, the language is 90-100, that's what he likes. But that can't be determined either. Egypt is hard to find a copy. Well, this can't be. This is not a good choice.

So, we just have to choose, the value of the multiplication of mathematics is better than the value of physics. If we look at the graph, the value of mathematics is always above. Mathematics is always above, compared to... It's always above, this is also always above, even though the difference is a little. Always above, always above, always above, always above.

So without calculating, if it goes up and down, maybe because there is a physics above, we have to calculate the average. What is the mathematical average? What is the physical average? We can determine which one is better. But in this graph, it's very clear that if the average is calculated, the mathematics must be better. Because all the values are above the physics. So the answer for this question is D.

That's how we read and interpret data. The ones that come out often are these ones. They come out often in essays or in the double-edged book. That's how it is. Thank you for watching this video. Good luck. If you find this video useful, share it with your friends so they can learn too. Don't forget to like the video, subscribe to Legurles channel, and follow Legurles Instagram. Thank you.