Hello Jack I guess 'one in ten' is an ellipsis of 'one in ten of the people'. So it should be taken as a kind of plural noun like 'many of the people'. Therefore my choice is #1.
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I guess 'one in ten' is an ellipsis of 'one in ten of the people'. So it should be taken as a kind of plural noun like 'many of the people'. Therefore my choice is #1. But some people would say like #2 if they want to be hypercorrect in grammar
one in every 43 pregnancies brings twins.
one in every 43 pregnancies brings twins.