Answer
The mean of the 51 entries is 8.82%. We are finding the average of the states, not the entire country. That is why the mean of the 51 entries is not 13.0%.
Work Step by Step
$ mean = (13.3+6.7+9.7+4.3+5.9+13.9+27.1+19.4+6.2+3.4+8.6+9.6+13.4+4.3+18.2+3.3+4.6+2.3+7.3+7.4+22.2+5.3+21.3+6.1+2+3.3+3.8+4.1+6.2+13.7+14.9+19.2+2.4+10.2+ 2.9+2.9+4.7+4.8+11.1+13.4+13.5+
16.5+5.5+3.9+4.7+8.4+9.5+5.9+3.9+13.6+1.3)/51$
$ mean = 450.1/51$
$ mean = 8.82%$
