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JimmyTheWig

chamelion wrote: »

99. made the stupidest mistake in the world using the wrong dataset for the "which quarter had lowest cost per project" - i swapped the primary and secondary y axis

Tammykitty wrote: »

I did the same for that question

And me!

I got 98, but with 4 wrong. Don't think it asked me 200 questions, though, so not sure how it worked that one out.
I wrong as above.
Two more wrong because I misread the question.

Then this one that I'm gutted about...

A school trip needs at least one adult to every seven students. The coach holds a maximum of 52 passengers. What is the maximum number of students that can go on the trip?
45
42
39
41

JimmyTheWig

rgpx wrote: »

I disagree about the "IT incidents average" one. They don't say what the right answer is supposed to be, I said it was "mode". Since 15 is definitely the mode (3 occurences - all other values only have one), the only other possible correct answer is "median and mode". But there are 3 occurrences greater than 15 and only one below, so that can't be right ...

3 @ 15, 3 greater, 1 below. E.g.
14, 15, 15, 15, 16, 17, 18
The middle number is the third 15, so that is the median.

JimmyTheWig

Tammykitty wrote: »

This is the other one I got wrong - what is the correct answer?

The graph shows house prices rising from £260k to £390k

An estate agent shows you this picture, and says 'House prices will go up 50% in the next five years.' What do you think of this claim?

• Definitely true
• Impossible to say
• Probably true
• Definitely false

I think I'd go with "Impossible to say".
It's clearly not either of the "Definitely"s.
While the last 5 years may be a good guide, I don't think the probability of them going up 49% is much different to the probability of them going up 50%. So the chances of them going up 49% _or_ 51% are higher than the chances of them going up by 50%. In which case them going up by 50% isn't "Probably true".

JimmyTheWig

spude000 wrote: »

Question
A Component has a 5% chance of being faulty. If you use 3 components in a device what is the chance that the device works?

I said 85%, as the chance of 1 being faulty is 1 in 20, if you have 3 it is 3 in 20, as you have 3 separate chances of it being faulty, so 15% chance of faulty or 85% not faulty.

They said 86%, which I assume means they have worked out the probability as 95% x 95% x 95% = 85.7% (86%), but that is the probability of the 3rd component being faulty, if you already know the first 2 are OK, which at this point we don't.

No, their answer is right.
To get a working device you need the first component to work, then the second component to work then the third component to work.
So P(working device) = 0.95 x 0.95 x 0.95

EDIT: Though some may argue the probability of the 3rd one failing if you already know the first 2 are OK is 5%, as previous history of results does not impact future events e.g. if you flip 10 heads in a row you are still just as likely to flip heads again as tales. Probability is FUN! with the exception of this question which is driving me mad.

Shrimply wrote: »

I THINK (although very happy to be corrected) that that probability would be 0.95*0.95*0.05 = 4.51%. Although I can also see an argument for it simply being 5%.

The probability of the third being faulty if you already know the first two are OK is 5%. As spude says, it's no different to the 11th coin toss.
4.51% is the probability of the third one being the only faulty one.

While the probability of exactly one being faulty would be 4.51% * 3 =13.5%

I agree.

Zeni

csreader wrote: »

I scored 97, with 5 "incorrect" answers. 3 of these were definitely my mistakes. One (effectively, which city is 180 miles from London?) I cannot tell what the "right" answer is.

I think this one is Liverpool, I got it wrong because I just saw north and put Leeds after working out the scale, didn't notice the 'north west' part opps.

eastcott5

I got 99. i got the population one 'wrong' I think their answer is 7.5 million - not billion - 1000 million?

cwallace

This this one is not solvable:
A fitness programme recommends walking 12,000 paces a day or about 80km a week. What is the average length of 1 pace:
87cm
1.05m
1.5m
95cm

I think the answer is 6.66m with the numbers above. This must be advice for a Giant :rotfl:

James_N

silvercar wrote: »

Never fed up of maths!

I scored 99; I wonder whether the one I missed was the one Martin is disputing?

Well done - however ... you DO need some help with your English!

MrChumley

cwallace wrote: »

This this one is not solvable:
A fitness programme recommends walking 12,000 paces a day or about 80km a week. What is the average length of 1 pace:
87cm
1.05m
1.5m
95cm

I think the answer is 6.66m with the numbers above. This must be advice for a Giant :rotfl:

Paces A DAY and km A WEEK. You forgot to divide by 7

nigeltrotter

Hi Martin. I got 1 wrong.....because I read it wrong. I selected Karl as the heaviest and only looking at the answers I saw the question asked for the lightest. That'll teach me!