【简答题】An established method of ysis for chlorinated hydrocarbons in an air sample has a mean of 12.5 mg/m 3 and a standard deviation of 0.030mg/m 3 . (1)Calculate the 95% confidence interval of mean of ...
【多选题】给出下面的类: public class Sample{ long length; public Sample(long x ){ length = x ; } public static void main(String arg[ ]){ Sample s1, s2, s3; s1 = new Sample(21L); s2 = new Sample(21L); s3 = s2; long m ...