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How to calculate the binomial in the HP30b?
12-31-2020, 01:07 PM
Post: #5
RE: How to calculate the binomial in the HP30b?
(12-30-2020 08:07 PM)FabioBrasil Wrote:  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?


The answer 0.3874 is the probability mass function (PMF) value, which is the probabilty of exactly k successes. The HP-30b doesn't have a built-in function for that. It has a built-in 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 built-in 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
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RE: How to calculate the binomial in the HP30b? - ijabbott - 12-31-2020 01:07 PM

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