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Posted by **deb** on Monday, April 30, 2012 at 1:18am.

1970 1980 1990 2000

17.2 17.3 17.1 16.6

do you add them all together then divide by 4

- math -
**visoth**, Monday, April 30, 2012 at 1:19amyes

- math -
**deb**, Monday, April 30, 2012 at 1:25am16.9%

- math -
**visoth**, Monday, April 30, 2012 at 1:30ami got 17.05% you might have put in one of thenumbers wrong check again

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