Mean in grouped distributions

   Today I'll be talking about how to find the mean in grouped distributions. I'm sure most people would know how to search mean. You need to search the sum of the datas and divide it by the number of values like this:

Q) 3, 1, 5, 7, 13, 9, 12, 3, 18, 11, 2, 18, 12, 19, 20, 5, 8, 17, 14 and 16. These are the scores of a video game for 20 people. Find the mean from their scores.

     First you add up the numbers: 3+1+5+7+13+9+12+3+18+11+2+18+12+19+20+5+8+17+14+16 

                                                      =213

     Then you divide it by the number of values: 213/20 = 10.65

      So therefore the mean is 10.65.

   Then you make a grouped frequency table:

     

Score	Frequency
1 - 4	4
5 - 8	4
9 - 12	4
13 - 16	3
17 - 20	5

                                   

                        

So 4 people got scores between 1 and 4, another 4 got scores between 5 and 8, etc..    Now that you know how to find the mean you might ask what mean in grouped distributions mean. In the procedure above you could know what are the scores of each person but what if the only information you received was the table. Could you still search for the mean? Not accurately but you can estimate and that's what you call finding mean in group distributions.        Firstly you'll have to find the midpoints of the score. To find the midpoint you'll have to add the two numbers and divide by two:           1+4 = 5    5/2   = 2.5           5+8 = 13  13/2 = 6.5         9+12 = 21  21/2 = 10.5       13+16 = 29  29/2 = 14.5       17+20 = 37  37/2 = 18.5    Then you'll have to multiply each midpoint with the frequencies:     2.5 x 4 = 10     6.5 x 4 = 26   10.5 x 4 = 42   14.5 x 3 = 43.5   18.5 x 5 = 92.5     and add them all together: 10+26+42+43.5+92.5 = 214  then divide by the number of people or the sum of the frequencies which is 20:   214/20 = 10.7    You can see that it's very close to the answer that we got earlier. So that's how you find the meaning grouped distributions. I hope this has helped you understanding means in grouped distributions a bit. I hope to see you guys again!

The war of Uhud

   Greeting, in today's post I'll be telling 10 facts of the war of Uhud that you might have known. Let's start with the first fact. Did you know, one of the reasons the war started was because the Quraisy wanted to retrieve the route to Syams (where the trading market is). The Quraisy in Mecca would need to pass through Medina to get to to Syams (which in the middle of the Roman empire and Persia), but because they do not want to pay tax to the Muslims in Medina for passing through, they decided to start a war and wanted to make Madinah as their property so they do not have to pay.

   While the Quraisy was moving to Medina, the Muslims had a spy spying on them, he was Saidina Abbas R.A. He was Prophet Muhammad's uncle.

   At the morning of the war, there was one man who converted to Islam.

   The Muslims left for Uhud on Friday after the Friday prayers and fought on a Saturday afternoon. This is during the month of Syawal.

   When the Muslims were heading to Uhud, there was one man name Abdullah bin Ubayy decided to betray the Muslim army and pull himself out from the army and 299 other people followed him. These people are called the Munafiks, they pretend to be a Muslim but they don't do the things required to be a Muslim. This has cause the Muslim army to decrease by 300 people even before the war started.

   Rasullulah offered his army to use his sword and Zubair bin Awwam wanted it but Rasullah gave one condition, it is ti us the sword forever until it is broken. After that, Abu Durjanah accepted the condition and he was the one to get the sword.

   Rasullulah was protected by nine people, seven ansars and two sahabats. They were assigned to help Rasulullah escape after they realised the muslims were losing. The ansar decided to be the decoys but the kafir was clever enough and got to Rasulullah anyways. The seven ansars were believed to died in matyr.

   After Rasulullah cried, the Jabal Uhud also cried and turned reddish to represent blood. It is said that Jabal Uhud will be one of the mountains in jannah.

   When Rasulullah checked the army before the battle started, he found underage kids in the army. They wanted to contribute but Rasulullah said you have to be above 15 year old to participate so four of them had to return but  some were accepted and one of them was Rafiq bin Khadij. He was accepted because of his exceptional archery skills.

   After the war, they started collecting the corpses of the Muslims and found one body that was in really bad condition that no one could recognize who it was, but miraculously his sister recognized him by looking at his finger.

   That is all I have for today. I hope we all learned something about the war of Uhud through this post and I hope to see you guys again.


   

 

Majulah Singapura!

   Today is the 9th of August which marks the 53rd national day of Singapore. You know sometimes us Singaporeans always look at Singapore's bad side that definitely can be improved but when it is national day season we all will get together as one and celebrate this memorable occasion. That's what makes this day special, we'll all be able to truly see the beautiful side of Singapore.

   It's a shame this year I won't be celebrating it in Singapore. Some of my friends will be performing in the NDP this year, I hope I'll also be able to do the same thing one day. It just makes me happy to watch the videos of NDP even though I don't attend it.

   That would be all from me, Thank you for reading and have a great national day and Majulah Singapura!

 

My special video

   Many of my friends or teachers or even my family members might not see me as someone who needs to watch videos as motivation, but in reality I always do. For example if I need motivation to give a presentation I'll watch videos people of giving presentations. Firstly because you can learn from it and it just relaxes myself to see someone doing something I'll be doing.

   This video is made by a part of a speech by Eric Thomas. His job is giving motivational speeches, and this is one of my favourites. It's very short and not even hard to understand, but sometimes you just need someone to tell or remind you this.

   Although it is a very short video, I hope it helps other people too just like it has helped me before.
Thank you for reading, and see you guys again.