01
Press these keys
2nd→VARS→DISTR→binompdf / binomcdf
Step 1 of 4. Press 2nd.
02
Walkthrough
- 1Translate
Exactly x means P(X=x): binompdf(n,p,x). At most x means P(X≤x): binomcdf(n,p,x).
- 2Open distribution
Press 2nd → VARS (DISTR), choose the command and enter n, p and x.
- 3Interpret
Check 0≤p≤1 and x is an integer from 0 to n.
03
Worked example
X~B(12,0.3). Find P(X=4) and P(X≤4).
NORMAL FLOAT AUTO REAL MP
binompdf(12,.3,4).231139...binomcdf(12,.3,4).723655...AnswerP(X=4)≈0.231; P(X≤4)≈0.724.