重金求大神赐教!统计学的一道题（关于置信区间）,

重金求大神赐教!统计学的一道题（关于置信区间）,
一种疾病经常发生在孩子身上.下边的数据是10个被感染孩子的年龄
7 12 8 4 9 3 4 9 5 2
计算并得出是否我们可以说被感染孩子的总体平均年龄不等于5的95%的置信区间.
PS：原题 A kind of disease often happen on the children.The follow data shows the age of ten children who are infected.
7 12 8 4 9 3 4 9 5 2
Test to determine if we can say that the population average age of infected children is not equals to 5 at a 95% confidence interval.