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Very quick probability help....

Question on attachement - 2(a)(ii)
I did 0.7*0.6*0.8 = 0.336
but the mark scheme gives the answer as 0.0336. What have I done wrong :/
Original post by Nkhan
Question on attachement - 2(a)(ii)
I did 0.7*0.6*0.8 = 0.336
but the mark scheme gives the answer as 0.0336. What have I done wrong :/


Nothing, the mark scheme is in error.


Original post by Rishabh95
You can also do 1 - (you answer to part (i))


:thumbsdown:
(edited 12 years ago)
Reply 2
Original post by ghostwalker
Nothing, the mark scheme is in error.




Really!!! :thumbsdown:


Am I wrong?
Original post by Rishabh95
Am I wrong?


Yes, that's incorrect.


None of the three arrive late is not the complementary event to all three arrive late.

You're forgetting the possibility that one arrives late, or two arrive late.
Reply 4
OOPS.......................
Reply 5
Ah right, thanks :smile:

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