margin of error
noun/ˌmɑːdʒɪn əv ˈerə(r)/
/ˌmɑːrdʒɪn əv ˈerər/
[usually singular]- an amount that you allow when you calculate something, for the possibility that a number is not completely accurate
- The survey has a margin of error of 2.5 per cent.
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margin of error