5. (8 scores) Suppose that the weights of the males in a town obey a normal distribution. Now 36 individuals are randomly selected with the mean weight as X = 67.5, and sample variance 52 = 142. Given the significance level a = 0.05, can we say that the mean weight of the males in this town is 72.4? ( It is known that to.025 (35) = 2.0301, to.025(36) = 2.2081, to.os(35) = 1.6896,3025(35) = 53.203; -0.025(35) = 20.569).