A surveyor wants to estimate the percentage of maple trees among all trees in a large national forest. It would be impossible to find the actual percentage (too time consuming). Instead the surveyor selects several areas at random and determines the percentage of maple tress in the selected sample to be about 30%. The number of trees in the sample was 400. The surveyor can be about 95% confident that the percentage of maple trees in the national forest is between____ % and ______%.