new student hp calc user would like to ask about hp20s


hello! I am a form 5 HK student . here, in the secondary school sci. calc. market, casios takes 98% of the market, sharps takes 1.5% and the 0.5% ard others. i have been using casios since 98 until last month, when i got a new hp20s. I am impressed by this calc, it is solidly bulit, has good keypad, many functions . its quite different from casios, I have practise for 2 weeks to become 70% familarized with it.

i would like to ask about the stat function:
suppose we have a set of data:
class mark: 5, 10, 15, 20, 25, 30
frequency: 8, 5, 8 , 10, 12, 9
in casios we can enter like this 5*8, 10*5, etc....
how about in hps? I cant find it and I have to use casios for stats in my exam. :-(
thanks in advance



It's been a while since I owned one of these, so I referred to for refresher. You enter the numbers as:

5 INPUT 8 \GS+ (the Sigma function, upper-left key)

10 INPUT 5 \GS+

15 INPUT 8 \GS+


and then "x-w compute weighted average" with a right-shifted square-root.

I don't think any other statistical functions can be computed for a weighted average problem. Hope this helps.




Since you already got an answer to your question, I will privide you with some free (albeit un-requested!) advice. ;-)

Do yourself a favor, and purchase an HP-32sII (before they disappear!). In my opinion, what you have is not really an HP. A "real" HP is much better. The HP-32sII uses an RPN (Reverse-Polish Notation) operating system (rather than algebraic). RPN will take you a few minutes to get used to, but it is _much_ easier to use, more efficient, and more robust! That calculator also has a large number of functions. It is also programmable, but with only enough program memory to hold one useful program.

And, if after that, you find yourself catching the HP bug---like the rest of us here---then you can look into some of the older HP calculators, which are true gems! But, as you are a student, I'm sure you don't have a lot of money to spend on calculators! Well, hopefully someday! ;-)




thank you for your reply.

what I want form the stats in standard deviation, mean, population stardard deviation. I do feel disappointed when I found that only weighted mean will work.

its a pity that only a few hps are approved to use in exam here, here's is a full list of exam approved hp calcs:

HP-6S HP-10 B HP-12 C HP-16 C HP-21 S HP-6S Solar HP-11 C HP-15 C HP-20 S

full list of other approved calc can be seen here:

very unfortunaty, hp32sii is not approved in exam. it was my first choice...... then I changed my mind and got a hp20s. but I aggree that I must get a hp32sii fast, before they become extinct.



Then, whithout any hesitation, try to get a 15C...


If we're going to mention tough calcs, consider the Hp21s, since it is a statistics calculator, the next step above an Hp20s.


I like the 15C well for general purpose science/engrg use, however for Prob & Stat speciality get the HP21S if you can find since it contains preprogrammed distributions(watch ebay or run HPMOC ad). Expect to pay $35 with manual to $175 without manual which is about the one year range on these.

Possibly Related Threads...
Thread Author Replies Views Last Post
  Does the HP Prime really compiles the user programs? CompSystems 3 958 12-13-2013, 01:55 PM
Last Post: Mike Morrow
  HP 50g switching two keys in the user keyboard Sean Freeman 9 1,474 12-05-2013, 11:44 AM
Last Post: Mark Puscas
  [OT] engineering student chalenge cyrille de Brébisson 1 536 11-25-2013, 10:06 PM
Last Post: FORTIN Pascal
  HP Prime - User manual lack bluesun08 6 1,106 11-08-2013, 05:38 PM
Last Post: bluesun08
  HP PRIME : strange behavior when trying user key capability Damien 12 1,537 11-03-2013, 11:02 AM
Last Post: Joe Horn
  HP-Prime Polynomials: User Guide and Request CompSystems 4 805 09-30-2013, 09:48 PM
Last Post: Han
  HP Prime Tip: Setting Up User Keys Eddie W. Shore 2 608 09-27-2013, 09:53 PM
Last Post: Eddie W. Shore
  Where to the 32-bit version of User Code Utiltiy for HP-41 ? Olivier (Wa) 2 555 09-26-2013, 01:55 AM
Last Post: Olivier (Wa)
  Where is the HP Prime User Guide? Steve S 34 3,002 09-20-2013, 10:11 AM
Last Post: Chris Tvergard
  Advanced User's Manual and solution to the ambiguity of data types [HP-Prime xCAS] CompSystems 15 2,142 08-20-2013, 03:37 PM
Last Post: Thomas Klemm

Forum Jump: