Hey there! Sign in to join this conversationNew here? Join for free

Sharp EL 9900 Calculator for Probability and Normal Distributions Watch

Announcements
    • Thread Starter
    Offline

    3
    ReputationRep:
    Does anyone know how to find the probability, say P(Z <1), using the above mentioned calculator.

    I have tried STAT DISTR pdfnorm(1) but it comes up with 0.2419.... instead of 0.84134.

    I can't find anything else in the manual.
    Offline

    8
    ReputationRep:
    I don't know this calculator, but to find P(Z<1) you need to look for a function that looks like "cdf" (cumulative distribution function) rather than pdf. The pdf function will give you the value of the normal bell curve at Z=1, but that's not P(Z<1), for which you need the cumulative version.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by old_engineer)
    I don't know this calculator, but to find P(Z<1) you need to look for a function that looks like "cdf" (cumulative distribution function) rather than pdf. The pdf function will give you the value of the normal bell curve at Z=1, but that's not P(Z<1), for which you need the cumulative version.
    Thank you. I didn't know what pdf and cdf stood for so that has been a great help in itself. I have now found cdfnorm(lower limit, upper limit [, mean, standard deviation]). when I enter (0,2) it gives me a value that I then need to add 0.5 to for the other half of the curve, as it were. I can live with that as it seems there isn't a function that will give me everything to the left of 2.

    I'll just have to think harder won't I.

    Thanks. Most helpful.
    Offline

    8
    ReputationRep:
    You should also be able to include the left hand half of the curve by typing in a large negative number, e.g. -1E6 as your lower limit.
    • Thread Starter
    Offline

    3
    ReputationRep:
    Yes, that worked. What a gem you are.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Will you be richer or poorer than your parents?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.