The following solver approximates the area of a normal distribution. The following equation uses L (Let) and G (Get), so this can be used for the classic HP 17BII and the silver HP 17BII+.
For x ≥ 0, enter x in ( X ) and then press (CDF) to solve.
For x < 0, enter abs(x) in ( X ), press (CDF) to solve, negate the result and add 1.
The area will be calculated from 0 (the center) to x.
Example 1: x = 2.5
2.5 (X), (CDF): Result: 0.99
Example 2: x = 1
1 (X), (CDF): Result: 0.84
Example 3: x = -1.5
1.5 (X), (CDF) [+/-] [ + ] 1 [ = ]: Result: 0.07
“Handbook of Mathematical, Scientific, and Engineering Formulas, Tables, Functions, Graphics, Transforms” Research & Education Association. 1984 ISBN 0-87891-521-4
The HP 17B series does not have a random number function. We can use the solver to generate random numbers. Random numbers between 0 to 1 are generator.
The format to use will depend on the version of HP 17B you are working with.
The code used will use pseudo-random generator:
r_i+1 = frac( ( π + r_i)^5 )
Classic HP 17B and HP 17BII:
We can use Let and Get to generate random numbers, they are used to generate in recurring sequences.
Enter a starting seed, press (R#).
For future random numbers, keep on pressing (R#).
Brown and Silver HP 17BII+:
We’ll use the two variables. Despite the fact that Let and Get are available on the silver HP 17BII+, they cannot be used in recurring sequences.
Enter a starting seed, press (R1#).
For the first random number, press (R2#).
For future random numbers, press [ STO ] (R1#), then (R2#).
Other pseudo-random number generators to try:
r_i+1 = frac( 997 * r_i )
r_i+1 = frac( 147 * r_i )
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