11 The average farm in the U.S. in 2004 contained 450 acres, with a standard deviation o 40 acres. By Chebyshev's Theorem, a) what is the size range (centered at 450 acres) that includes at least 80%...

Extracted text: 11 The average farm in the U.S. in 2004 contained 450 acres, with a standard deviation o 40 acres. By Chebyshev's Theorem, a) what is the size range (centered at 450 acres) that includes at least 80% of the farms? b) what is the size range (centered at 450 acres) that includes at least 90% of the farms? Round the answer to whole numbers of acres.