Section I: Multiple Choice (2 Viewers)

jer3m

Member
Joined
Oct 16, 2014
Messages
78
Gender
Undisclosed
HSC
N/A
No. If there are 31 days in October and there is an expected 8 rainy days and then the first day is rainy and they expect the second to be it becomes 8/31 x 7 (the remaining expected) x 30 (the remaining days). That's how in THEORY probability works. If you threw a coin 9 times and it was heads all the time the final chance would still be 1/2 for a tail. This question however doesn't follow that idea.
It is 8/31 x 7/30 hence A.
 

jer3m

Member
Joined
Oct 16, 2014
Messages
78
Gender
Undisclosed
HSC
N/A
If the question did not say consecutive then yes you would be right. But it is consecutive. Thereby you have to remove the previous day/rain. Think of it as a tree diagram
 

ag6858

Member
Joined
Dec 17, 2011
Messages
67
Location
Sydney
Gender
Male
HSC
2014
Uni Grad
2018
Haha I figure I'm not going to be able to change your mind on this. Let's just agree to disagree
 

Hanakalala

New Member
Joined
Nov 20, 2012
Messages
15
Gender
Female
HSC
2013
1. D
2. B
3. C
4. B
5. B
6. D
7. D
8. A
9. C
10. A
11. C A
12. C
13. B
14. D B
15. B
16. A
17. B
18. D
19. A
20. D B
21. A C
22. B
23. C
24. D
25. A

^ Thoughts?
Can't remember exactly all mine (forgot to circle) but the ones i recognised i put different are in bold... i could be wrong so don't panic too much haha
In the test, I got the same as what you just said besides question 20. I circled D, although I think I am wrong.. Anyone care to shed some light on the working out for Question 20?
 

ag6858

Member
Joined
Dec 17, 2011
Messages
67
Location
Sydney
Gender
Male
HSC
2014
Uni Grad
2018
No. If there are 31 days in October and there is an expected 8 rainy days and then the first day is rainy and they expect the second to be it becomes 8/31 x 7 (the remaining expected) x 30 (the remaining days). That's how in THEORY probability works. If you threw a coin 9 times and it was heads all the time the final chance would still be 1/2 for a tail. This question however doesn't follow that idea.
It is 8/31 x 7/30 hence A.
http://www.boardofstudies.nsw.edu.au/hsc_exams/2014/pdf_doc/2014-mg-maths-general-2.pdf
Or not...
 

Users Who Are Viewing This Thread (Users: 0, Guests: 2)

Top