Binomial cumulative distribution function For X (n,p) and an integer x with 0 <= x <= n, P(X <= x)=P(0 <= X <= x)= _k=0x nkpk(1-p)n-k A binomial cumulative command returns P(X <= x). Express the required probability in this form before using the calculator. In the table, a,b are integers in [0,n]; set P(X <= -1)=0. **Required probability** | **Cumulative form** | **Condition** P(X <= n) | 1 | All binomial models P(X
a) | 1-P(X <= a) | Integer boundary P(X >= a) | 1-P(X <= a-1) | Integer boundary P(a <= X <= b) | P(X <= b)-P(X <= a-1) | a <= b P(a