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It is 11.4.

To round to 1 decmal place you need to get rid of the digit in the second decimal place.

If that digit is 0, you just drop it.

If it is 1-4 then you also drop it.

If it is 6-9 then you drop it BUT increase the previous digit by 1.

If it is 5 ...

Now here is a problem. If you always drop the 5 you introduce a downward bias. If you always increase the previous digit, you introduce an upward bias. So, with a 5, you need to round down half of the time and round up half the time so as to avoid a bias. A statistically sound solution is to round up or down so that the previous digit is even.

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14y ago

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