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    • Thread Starter

    Hi everyone,

    I have the Casio Calculator model - fx-991ES PLUS model. Through button bashing on my calculator I have discovered how to calculate probabilities such as P(Z<2.12) and P(-1.57<Z<1.57).

    I am asking if anyone knows how to calculate the constant 'a' on calculators that can do this function; for questions such as P(Z>a)=0.0287 and P(-a<Z<a) = 0.582

    To do the normal distribution questions as stated in the paragraph for P(Z<2.12) etc. for my calculator, go on - mode/stat/1(1-VAR)/AC/SHIFT 5 (distr) and then either choose 'p','q','r' accordingly. If I helped anyone out in this great.

    Can anyone please help me find a way to do this for the variable 'a?' Thanks in advance for your replies

    Such a function isn't available on that model. You can try using the Newton-Raphson method to calculate inverse functions, if the calculator supports numerical derivatives and you know that method. Otherwise, it's best to use the tables anyway.
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