统计概念问题 ,

题目

统计概念问题 ,
If X follows a normal distribution with μ=30 ,σ=5 ,then P(X=40)?
a.  0.0108                    b.0           c.  0.4772              d.  0.5    e.none of the above
the location of a nomal curve is determined by
a.mean       b.range          c.standard deviation      d.variance       e.none of a above
the shape of a nomal curve is determined by
   a.mean         b.range          c.standard deviation         d.mode       &n

答案