Using calculator T1 NSpire CX to calculate probability distribution function

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To calculate the probability distribution function, we use the youtube video example.


  1. click calculate 
  2. click menu 
  3. choose the 5th option probability
  4. go to the 5th option distribution
  5. look for option A binomial Pdf (probability distribution function)
After that, there is a window poped up, ask us to enter the following values:

  • Num Trails, n:
  • Prob Success, Trails, n:
  • Prob Success, p:
  • X Value:
As we flip coin 5 times, so we enter n=5
As the probability of flipping the tails is 0.6, so we just enter 0.6 in p
Next, X value representing the number of tails that we are interested in for this example, so we enter 
3 for the first question and 1 for the second question
Next, X value representing the number of tails that we are interested in for this example, so we enter 
3 for the first question and 1 for the second question
Finally, we press ok

We see the screen give the answer of binomPdf(5,0.6,3)  = 0.3456  
the probability of 3 tails in 5 flips with this biased coin is 0.3456 

For the second question, we type binompdf (5,0.6,1) and the calculator can recognize that 
 then press enter we got 0.0768