NO.PZ2017092702000079
问题如下:
The value of the cumulative distribution function F(x), where x is a particular outcome, for a discrete uniform distribution:
选项:
A.sums to 1.
B.lies between 0 and 1.
C.decreases as x increases.
解释:
B is correct.
The value of the cumulative distribution function lies between 0 and 1 for any x: 0 ≤ F(x) ≤ 1.
我知道选b,A错在应该超过1,比如F(-2)+F(1),F(1)的面积已经覆盖了F(-2)的面积了,所以超过1,我的理解对不?c错在x变大那个F(X)也变大因为都是看左边的面积,越往右面积越大,对不。