Stuck on Accuracy categories

[MimiTa]

Ages ago,I came across this 11+ question,yet did not write down the answer and cannot remember where I got it from. A friend and I are baffled about what it is needed and how to do it. Can anyone help,please? Is something missing in the question or there is a reason for this?

Accuracy categories 1.casual measurements, 2SF
2. important or technical things (3SF)
3.really scientific work (3 or more SF)

a) estimate distance of a journey 320miles, 15 miles or 2 400 miles

b) estimate area of a garden/floor 480m square or 18m square

[ToadMum]

Ages ago,I came across this 11+ question,yet did not write down the answer and cannot remember where I got it from. A friend and I are baffled about what it is needed and how to do it. Can anyone help,please? Is something missing in the question or there is a reason for this?

Accuracy categories 1.casual measurements, 2SF
2. important or technical things (3SF)
3.really scientific work (3 or more SF)

a) estimate distance of a journey 320miles, 15 miles or 2 400 miles

b) estimate area of a garden/floor 480m square or 18m square

It strikes me that there is definitely something missing, although (b) makes some sense in that '18m square' could be a garden or a very large room.(18 square metres' would be post of room-size or a rather small garden).

'Distance of a journey' could be any of those given...

[MimiTa]

Thanks,but what accuracy category it belongs to,or any of these figures when they are all whole numbers?I think that is what they asked,to put the answer into a category.