rough guess

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Thus I made the rough guess that a young man and his wife, a child, and a mother-in-law were among the inhabitants of this idyllic cottage.
That it was far south of the equator was evident from the constellations, but I was not sufficiently a Martian astronomer to come much closer than a rough guess without the splendid charts and delicate instruments with which, as an officer in the Heliumite Navy, I had formerly reckoned the positions of the vessels on which I sailed.
At a rough guess, there are forty ladies at this lawn-party.
On a front view it appeared to consist principally of two spheres, bearing about the same relation to each other as the earth and the moon: that is to say, the lower sphere might be said, at a rough guess, to be thirteen times larger than the upper which naturally performed the function of a mere satellite and tributary.
At a rough guess the gulf was forty feet across, but, so far as I could see, it might as well have been forty miles.
Back in the day there was a man called a meter inspector who read the meter every 3 months and if he was asked nicely he could give a rough guess how much the next bill would be.
At a rough guess I'd say I have about 40 of them so far.
And so, in this almost alpine setting, quite why Grenoble has this reputation for one of the finest fish recipes in the world is beyond me, given it's situated, at a rough guess, just under 250 miles from the nearest coastline.
While it is unlikely the state would attempt to eliminate all tolls in one fell swoop, Bass explained that the $30 billion price tag was a rough guess and that it would likely take "weeks and weeks" to produce a more accurate number.
It's unclear who he is or what caused him to lose his balance - but we could take a rough guess.
A rough guess at price would be about PS30,000 but Ford are likely to announce the exact figure at Geneva.
A rough guess might have been good enough for the Greeks, but not so today for the more finicky people, like those at the National Institute of Standards and Technology (NIST).