OOM (Order of magnitude) estimate
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The letters 'OOM' often refer to 'Out Of Memory' in computing and software. Alternatively, OOM may mean 'Out Of Money', such as in the computer game series The Sims.
It means make an estimate that is too large.
You calculate the actual sample mean, and from that number, you then estimate the probable mean (or the range) of the population from which that sample was drawn.
It basically means that you round it up and down. For example 593- 158. For the low estimate the problem would look like this 590-150. For the high estimate the problem would look like this 600-160.
It means someone has written the question wrongly because it is impossible to measure mass in kilometres.