Q25 (1 Viewer)

[IP_freely]

can sum1 post there answers up for 25biii and the whole of c

 

[_random_]

Im not sure but i did 1/3 x 1/2 = 1/6

could easily be wrong tho

 

[Annegelic]

um.. is that the icecream question ?

 

[Skeeta]

yep the icecream on
and yeah i did it the same as _random_

she has a 1 in 3 chance of pickin choc first
then u times it by 1 over 2 because she has a 1/2 chance of picking that second

and you get 1/6

 

[_random_]

yep, i think that is right but hey i could easily be wrong

 

[ChRiS_2004]

Answers That I Got!!!!

I got the same answer for part iii of question 25 (b).
For question 25 (c) these are the following answers:
(i) 40 10
20 130

(ii) 130 + 40= 170

(iii) 170/200*100= 85%

(iv) 20/200*100= 10%

 

[Annegelic]

lol omg. i drew a tree diagram and sample space.. then got 1/9 i think. obviously that's wrong.

but i got the same as chris_gleeson for c.

 

[IP_freely]

yer thnx chris wat u got was wat i got im happy now... just needed to make sure

 

[Skeeta]

question c of 25... i got
_____________________________________________
________I test showed lie I test did not show lie I total I
_______________________________________________________
Liars I 40 I 10 I 50
______________________________________________________

Truth I 20 I 130 I 150
______________________________________________________

ii) i got 170 (40 + 130)

iii) i got 85% (170/200 x 100)

iv) i got 20/130 (2/13)

hope thats it... apologies for my dodgy diagram hehe

 

[ChRiS_2004]

Thats cool. Hope you do well in your results.

 

[golferjim]

I got the same answer for part iii of question 25 (b).
For question 25 (c) these are the following answers:
(i) 40 10
20 130

(ii) 130 + 40= 170

(iii) 170/200*100= 85%

(iv) 20/200*100= 10%

I think that for part (iv) the answer is 20/150 = 13.3% as it is only for the % who did NOT lie

 

[Stilla]

I got your answer annegelic.

 

[Skeeta]

chris... for part iv) wouldnt it be 20/150?? not 200??

i got my answer because it says what is the prob that the test indicated a lie for those that didnt lie... and there are 150 that didnt lie and 20 indicated a lie???

i dunno

 

[Stilla]

I think my answer was 2/15

 

[ChRiS_2004]

I think that for part (iv) the answer is 20/150 = 13.3% as it is only for the % who did NOT lie

Thats right. I know where i wne twrong. I now know that i got 2 wrong marks in the paper. Thanks for that.

 

[dont_b_simple]

Q25
C ii) 170
iii) 85%
iv) 20/150 = 2/15

 

[Skeeta]

eeek sorri
it shits me 2 wen that happens

 

[Stilla]

Yeah, IV was NOT asking for a percentage.

 

[golferjim]

I think my answer was 2/15

Yeah brah, i just realised that i did put 2/15 and not 13.3%

 

[golferjim]

For 25 (b) what did people get for (i)

I had 6