Huh? The question says that in a period of 24 hours, the mean number of cars is 0.8.
So in a period of 48 hours, the mean number of cars is 1.6.
Now, one car has already passed through - you start a countdown as soon as that car passes through. (not counting it) What is the probability that at least one car passes through in the next 48 hours?
Huh? The question says that in a period of 24 hours, the mean number of cars is 0.8.
So in a period of 48 hours, the mean number of cars is 1.6.
Now, one car has already passed through - you start a countdown as soon as that car passes through. (not counting it) What is the probability that at least one car passes through in the next 48 hours?
Ah right didn't realise it was a countdown. Thanks
I think the first bit where the car has been caught speeding just defines the start of the time period, just like saying 'it's 12 o'clock now, find the probability that in under 48 hours another car will have been caught speeding'.
Hey Sean, any Madmaths questions you've come across that are hard?. I think this paper will be hard cos last year had the highest grade boundaries for the last 7 years...but I can't really think of any topics which can be made really hard
Hey Sean, any Madmaths questions you've come across that are hard?. I think this paper will be hard cos last year had the highest grade boundaries for the last 7 years...but I can't really think of any topics which can be made really hard
I haven't done any I'm afraid - they were made after I sat A-levels, I think. (that, or I hadn't heard of them before) but it's definitely worth flicking through the relevant booklets and looking for questions if you've run out of stuff to do.
That's the thing with stats, they can't throw anything extremely challenging at you. If you're happy with the most recent papers then you should be fine. (Maybe, just maybe, have a look at those kind of distributions with shape questions and make sure you're confident on those (eg uniform distribution models one length of a rectangle, find the area etc).
I haven't done any I'm afraid - they were made after I sat A-levels, I think. (that, or I hadn't heard of them before) but it's definitely worth flicking through the relevant booklets and looking for questions if you've run out of stuff to do.
That's the thing with stats, they can't throw anything extremely challenging at you. If you're happy with the most recent papers then you should be fine. (Maybe, just maybe, have a look at those kind of distributions with shape questions and make sure you're confident on those (eg uniform distribution models one length of a rectangle, find the area etc).