解: 因为?=1,所以?的置信度为0.95=1?0.05的置信区间为.....................1分(X?u?/2?n,X?u?/2?n)...................................3分其中?=0.05,=0.025,u?/2=1.96,n=100,X?5.........................................4分2所求区间为(4.804,5.196).........................................................5分 ?