HELP NEEDED!!! Urgent! Maths p4 probability question!! :(

[Warrior66]

Can anyone explain probability question:
2a)iv. http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w07_qp_4.pdf
I don't understand probability at all!! So if anyone could PLEASE help, it would mean the world to me!!!!

 

[n00bfi]

*facepalm*

 

[Warrior66]

*sarcastic* thanks you make me feel a LOT better!

 

[n00bfi]

Okay, I'll help you then:

There are 4 students that got grade 5, out of 28. Therefore, the probablity of choosing a student that got grade 5 is 5/28.

Therefore, for two students it would be:

5/28

times

4/27 (because you're taking away one student.)

There you go, easy innit? No offence dude, but I believe you're gonna have a hard time with the P4. Jussayin'.

 

[Warrior66]

Okay, I'll help you then:

There are 4 students that got grade 5, out of 28. Therefore, the probablity of choosing a student that got grade 5 is 5/28.

Therefore, for two students it would be:

5/28

times

4/27 (because you're taking away one student.)

There you go, easy innit? No offence dude, but I believe you're gonna have a hard time with the P4. Jussayin'.

*Clearing throat* Maybe YOU are the one who's gonna have a hard time---> it's really supposed to be 4/28 and NOT 5/28.....yes i did take it as an offence.........and plus i got the answer way before you replied back but thanks anyways. -_-

 

[n00bfi]

Ah, yes, thanks for pointing that out.

BUt now my question is why you replied to this thread if did get the answer...?