Each half of the year consists of 52 / 2 = <<52/2=26>>26 weeks.
For the first half of the year, Nicki ran a total of 20 * 26 = <<20*26=520>>520 miles.
For the second half of the year, Nicki ran a total of 30 * 26 = <<30*26=780>>780 miles.
For the entire year, Nicki ran a total of 520 + 780 = <<520+780=1300>>1,300 miles.
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