01
Press these keys
normalcdf(→binompdf(→binomcdf(
Step 1 of 3. Press normalcdf(.
02
Walkthrough
- 1Write the event
Translate words into notation before choosing a command.
- 2Check parameters
For binomial use integer n, 0≤p≤1 and valid x. For normal use σ>0 and lower<upper.
- 3Check command
pdf is exact mass for binomial; cdf is cumulative. normalcdf needs lower and upper bounds.
03
Worked example
‘At least 5’ was entered as binomcdf(n,p,5).
NORMAL FLOAT AUTO REAL MP
incorrect: P(X≤5)correct: 1−binomcdf(n,p,4)AnswerUse the complement through 4.