How to calculate the binomial in the HP30b?

12302020, 08:07 PM
Post: #1




How to calculate the binomial in the HP30b?
Hi
I purchased an HP30b financial calculator and am very satisfied. I used an HP12c for five months, but I didn't get used to the layout of the keys (very polluted look!). I found the HP30b more complete !. I know that the HP30b does the binomial calculation (Math> Probability> Binomial), but I don't know how to enter the data. I made a program for this, but I know that the calculator does it automatically. How do I enter the data for the binomial calculation? for example: n = 10 k = 1 p = 0.1 I know the answer is 0.3874 (38,74%) How do I calculate directly with the HP30b? Thanks! 

12312020, 11:25 AM
(This post was last modified: 12312020 11:30 AM by Gamo.)
Post: #2




RE: How to calculate the binomial in the HP30b?
I don't have the HP30b but I did post on about calculate the Binomial for
the HP12C since you also got the 12C so you might try this out first and see if it is harder or easier to do between 30b and 12c https://www.hpmuseum.org/forum/archive/i...11264.html for example: n = 10 k = 1 p = 0.1 I know the answer is 0.3874 (38,74%) Once enter this program to run. [f] 4 for Fix 4 10 [ENTER] 1 [ENTER] .1 [R/S] display 0.3874 Gamo 

12312020, 11:50 AM
(This post was last modified: 12312020 11:57 AM by Stevetuc.)
Post: #3




RE: How to calculate the binomial in the HP30b?
(12302020 08:07 PM)FabioBrasil Wrote: Hi From the 30b user guide page 23: HP30b userguide Binomial Functions The binomial function calculates the probability of having up to k successes out of n throws, when the probability of success is p. Enter n and p each followed by = and type k and navigate to the binomial function in the math menu. 

12312020, 01:03 PM
Post: #4




RE: How to calculate the binomial in the HP30b?  
12312020, 01:07 PM
Post: #5




RE: How to calculate the binomial in the HP30b?
(12302020 08:07 PM)FabioBrasil Wrote: Hi The answer 0.3874 is the probability mass function (PMF) value, which is the probabilty of exactly k successes. The HP30b doesn't have a builtin function for that. It has a builtin function for the cumulative distribution function (CDF) value, which is the probability of k or fewer successes. The answer for that is 0.7361 (73.61%). Well, you could use the builtin binomial CDF to calculate for n=10, p=0.1, k=0, store that in a memory, calculate for n=10, p=0.1, k=1, and subtract the previously stored value, but that is cumbersome and error prone. It would be easier to use the PMF formula you already know. — Ian Abbott 

12312020, 07:08 PM
(This post was last modified: 12312020 08:20 PM by FabioBrasil.)
Post: #6




RE: Como calcular o binômio no HP30b?
I thank everyone! I was able to get the answer with the Learning Module suggested by the moderator Genes. Through this material, I saw that the binomial in the HP30b is an embedded function calculated for the value of the cumulative distribution function (CDF). Unlike HP Prime that does it directly! I did what Ijabbott suggested and everything went well. Every day I like this calculator more. Thank you and have a great new year!


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