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Urgent: Maths CIE Stats

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Deadly_king:

--- Quote from: mousa on November 05, 2010, 04:39:37 am ---hey guyss how about Questions 5 and 6 any of you remember their answers???
which bitts you found tricky???

--- End quote ---

That was the normal and binomial distribution, right?

Unfortunately I can't remember the values I got :(

$!$RatJumper$!$:
do u guys remember the actual question for the last question includin all its parts?

Deadly_king:

--- Quote from: $!$RatJumper$!$ on November 05, 2010, 06:29:53 am ---do u guys remember the actual question for the last question includin all its parts?

--- End quote ---

Here you are :

7. A committee of 6 people, which must contain at least 4 men and at least 1 women, is to be chosen from 10 men and 9 women.

i) Find the number of possible committee that can be chosen. [3]

ii) Find the probability that one particular man, Albert and one particualr woman, Tracey are both on the committee.[2]

iii) Find the number of possible committees that include either Albert or Tracey but not both. [3]

iv) The committee that is chosen of 4 men and 2 women. They queue up randomly in a line for refreshments. Find the probability that the women are not next to each other in the queue. [3]

$!$RatJumper$!$:
These were my answers:

i) (10C4*9C1*14C1) + (10C4*9C2) + (10C5*9C1) = 36288

ii) (9C4*8C0) + (9C3*8C1) / 28728 = 1/36
 
iii) (9C3*8C1*13C1) + (9C3*8C2) + (9C4*8C1) + (8C1*9C4) + (8C0*9C5) = 13230

iv) 6!-(5!*2!) / 6! = 2/3

Can anyone confirm my answers :)

$!$RatJumper$!$:
And i think i got 60/75 for P1 and 43/50 for S1 ... what do you think my grade will be, based on the threshold you guys consider to be used :)

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