How was S1 Statistics 62?

[Heyyy]

Aha exactly 10 selections and 60 arrangements I got only 9 selections that's why I got only 54 arrangements. What I did exactly is that I wrote the arrangements under each selection but I didnt multiply by 3! I dont think there is a difference right ?? Anyway then I found that there are 30 selections out of 54 where the smallest number is 1 and then 18 out of 54 with smallest number 2 then only 6 out of the 54 with the smallest number 4 so apparently the number of arrangements I got where the smallest number is 2 or 4 is right but 1 is not right as it should have been 24 instead of 18 so yeah I hope I would get those 3 marks as you said because I really wish that I can get the star in the Math Alevel and el7amdullah all the other questions are totally right .

We simply had to calculate the selections;which were 10.
Note them down starting with 1 then 2 and then 4.
We had to write probabilities for only 1,2 and 4 as they can be the smallest digits in each selection.
There were 6 with 1 smallest
3 with 2
1 with 4.
Probability table: 0.6,0.3,0.1.
You will get 2 at max.
You didn't get the selections right.You didn't get the arrangements right either.You used the wrong information.Got wrong probabilities.
I think 2 is the max you can get but considering how tough the checking is in a levels,you never know!

 

[Heyyy]

Yup i did the same method,but the question was of 3 marks so i wondered why we had to take numerous selections but then i did that minus one and it gave same ans so i knew both were correct in the hall.In the exam i did that 3 selection addition one though

In exam we have to show complete workings right?
So I wrote 1C1 as well to show that we are selecting one of them.
Although the end result was same.

 

[asadalam]

In exam we have to show complete workings right?
So I wrote 1C1 as well to show that we are selecting one of them.
Although the end result was same.

Either way its the same thing.My sir said examiners dont nitpick and just look at the genral attempt and answer not the insignificant things,though i myself did include 1C1

 

[Aegon the Dragon]

For the probability distribution table, I got the following:

S ----------- P(S)

1 ----------- 9/25
2 ----------- 7/25
4 ----------- 5/25
6 ----------- 3/25
7 ----------- 1/25

The probabilities add to 1.

I made this considering that 7 could be considered the smallest digit only for 777, 6 would be the smallest digit for 767, 676, and 666, and so on for the other values of S.

I don't think it's right that you assume only certain values of S can have combinations with the smallest number, in 777 for example 7 is the least and the greatest digit at the same time (obviously, since it's the only digit) so it can be counted as one of the combinations with 7 as the least digit.

 

[asadalam]

For the probability distribution table, I got the following:

S P(S)

1 9/25
2 7/25
4 5/25
6 3/25
7 1/25

The probabilities add to 1.

I made this considering that 7 could be considered the smallest digit only for 777, 6 would be the smallest digit for 767, 676, and 666, and so on for the other values of S.

I don't think it's right that you assume only certain values of S can have combinations with the smallest number, in 555 for example 5 is the least and the greatest digit at the same time (obviously, since it's the only digit) so it can be counted as one of the combinations with 5 as the least digit.

The thing is ,we only had 5 limited disks.So there could be no repetition.

 

[Aegon the Dragon]

The thing is ,we only had 5 limited disks.So there could be no repetition.

Ah that makes sense... so combinations like 111, 222, 242, 626 etc. aren't possible. Drat, should have thought of that.

Well, here's to hoping I still get some marks for my efforts in that question

 

[Heyyy]

For the probability distribution table, I got the following:

S ----------- P(S)

1 ----------- 9/25
2 ----------- 7/25
4 ----------- 5/25
6 ----------- 3/25
7 ----------- 1/25

The probabilities add to 1.

I made this considering that 7 could be considered the smallest digit only for 777, 6 would be the smallest digit for 767, 676, and 666, and so on for the other values of S.

I don't think it's right that you assume only certain values of S can have combinations with the smallest number, in 777 for example 7 is the least and the greatest digit at the same time (obviously, since it's the only digit) so it can be counted as one of the combinations with 7 as the least digit.

How can 7 or 6 be the smallest digits in any combination? LOL.

 

[omaaaar]

Guys if anyone of u wants to have a look at the stats question paper go to this link
http://justpastpapers.com/cie-9709-statistics-and-probability-paper-62-mayjune-2015-question-paper/

 

[asadalam]

Guys if anyone of u wants to have a look at the stats question paper go to this link
http://justpastpapers.com/cie-9709-statistics-and-probability-paper-62-mayjune-2015-question-paper/

Havent they posted the solutions yet?

 

[The Sarcastic Retard]

Havent they posted the solutions yet?

Posted the next day of the paper.

 

[omaaaar]

Havent they posted the solutions yet?

They have posted the solutions as well but there are always some mistakes in their solution
Just wait a min I will give u the link to the answers as well

 

[The Sarcastic Retard]

http://justpastpapers.com/cie-9709-statistics-and-probability-paper-62-mayjune-2015-answers/

 

[omaaaar]

Here is the link to the answers
http://justpastpapers.com/cie-9709-statistics-and-probability-paper-62-mayjune-2015-answers/

 

[shafkathussain]

I gave 6.99 days instead of 7 :/ Should it be a problem?

 

[R_Ma7mooD]

I gave 6.99 days instead of 7 :/ Should it be a problem?

I dont think it will be the usually set a range for the answers, so a 0.01 wont be a problem I guess.

 

[nighthawk]

Hey guys, anyone gave their computing exam? Computing 9691 paper 32. If yes, what is the gt you expect to be? Vote at this thread.

https://www.xtremepapers.com/community/threads/computing-9691-paper-32-2015-expected-gt.41556/

 

[Falconwing]

Q4 - I don't think the events are independent, so why would you multiply them?