Q25 (1 Viewer)

[em_516]

..it's 20/200..it asks "what is the probability that the test indicated a lie for a person who did NOT lie?" which directs you to the box at the bottom left of the chart..which should say 20..you're finding out this percentage out of the WHOLE group..which is 200..so 20/200..and therefore 1/10..and it stays as a fraction because when they ask for the probability, it should be displayed as a fraction unless they ask for a percentage..which they didn't..

that's what i thought anyway..

 

[Skeeta]

yep me 2

1 x 2 x 3 = 6

 

[Alain]

if i put 20/150 and didnt simplify it to 2/15 will i get it wrong

 

[Annegelic]

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

I had 6

yep 6.. 3 x 2 x 1

 

[Stilla]

Doubtful. It's only one mark.

 

[little_red_fox]

Q25. B iii)
I got 1/9, didn't read "any two different flavours at random", it's the only thing I got wrong in the whole exam! It's a two mark question, do you think I'll lose both marks?

 

[lexii]

Yeah, IV was NOT asking for a percentage.

No it wasn't, it was asking for the probability. And it's acceptable to leave a probability as a percentage, fraction or decimal, as they are all correct.