Question about Texas Instruments TI-83 Plus Calculator

# Statistics We were using our TI 83Plus and 84Plus calculators to simulate a die rolling experiment. We were using the random integer generator to generate 5 rolls of the die, then we used the sum command to add the five rolls together and divided by five to find the sample mean. Here is what we typed into the calculator....sum(randint(1,6,5))/5. Nowm here is the interesting thing. I had 5 people do this 20 times each to generate 100 sample means. We are studying the central limit theorem in statistics class. We discovered that 2 of the 5 calculators were generating the exact same list of sample means...in the exact same order. Why and how could this happen?

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OK...OK

Posted on Dec 04, 2007

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Random number generators on computers are not really random. They need to be "seeded". If you seed the random number generator with the same seed each time you will generate the same list of numbers. A common technique in computer programming is to seed the random number generator with a value like the number of seconds that has occurred since midnight. This gives you the illusion of real random numbers.

Look up the word "Seed" in your calculator documentation and it will most likely tell you how this is accomplished on the TI calculators.

Posted on Nov 20, 2007

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1 Answer

### I want a calc that has a space for me to type in a sum

What kind of sum would that be? If it is a sum of a certain number of values that are explicitly given (2+5.5+ 16...) just enter them one after the other separated by the operator (+).
For a sum of terms that are defined by some recursion fornula then you will need a calculator with a Computer Algebra System (TI Nspire CAS, TI 92PLUS, TI Voyage 200 PLT, Casio ClassPad, HP 40G/49 G+/50G..)
A TI 83PLUS/84PLUS may be able to handle numerical sums of terms defined recursively.

Aug 30, 2011 | Office Equipment & Supplies

1 Answer

### How do I generate a random number that is greater than 1 on a casio fx-300MS

The random number function always generates a number between zero and one. You can convert this to a random number in any range by a suitable combination of multiplications and additions. For example, if you want a random number between zero and ten, multiply the generated random number by 10. If you want a random number between one and ten, multiply the generated random number by 9 and then add 1.

If you want to simulate the roll of a six-sided die, multiply the generated random number by 6, add 1, and ignore the fractional portion. This will give you a 1, 2, 3, 4, 5, or 6 with more-or-less equal probability.

Mar 10, 2011 | Casio FX-300MS Calculator

1 Answer

### How do i generate random integers with a ti 89 titanium?

Use the rand() function. If you give it a positive integer argument n, it will return a random integer in the range in the interval [1, n]. You'll find rand() in the MATH/PROBABILITY menu.

Dec 08, 2010 | Texas Instruments TI-89 Calculator

1 Answer

### How do I program the calculator to read random numbers 1-50?

The post answer the question concerning how to generate random integers. The example given is for rolling a dice. I am inserting the modification that treats your case at the end.

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates keypresses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

To generate random number between 1 and 50
Int(Ran#×50)+1

Jul 16, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

### How do i generate random numbers on the casio fx-9860G

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates key presses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

Jul 06, 2010 | Casio CFX-9850G Plus Calculator

1 Answer

### I have a casio fx9750GA plus and need to know how to generate random numbers. I have had a quick look at users manual but can't find it. Can you help?

The following uses keystrokes and screen captures from the FX-9750GII but the essential information is the same. Use the F6 key to move to next page of TABS (those at the bottom of screen) until you find the TAB that interests you (PROB, RAND#, INT, etc.)

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates key presses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

May 21, 2010 | Casio CFX-9850G Plus Calculator

1 Answer

### How do i turn my "DiagnosticOn" on my TI-89?

If you open the CATALOG of commands, you will not find a DiagnosticOn command. It does not exist for the TI89 because whenever R and R2 correlation coefficients are meaningful they are calculated by default and displayed on the screen where you get the regression equation. If they are not defined bu the statistical theory no R or R2 are calculated.

In short You do not need a DiagnosticOn command to have R and R2 calculated. If the regression model uses them, they will be calculated by default.
By the way, DiagnosticOn is a command for the TI83/83Plus/84Plus but not for the TI89/89Titanium/92/92PLUS/Voyage 200PLT.

Apr 06, 2010 | Texas Instruments TI-89 Calculator

1 Answer

### Generating radom itegers

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates keypresses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

Mar 03, 2010 | Casio FX-9860G Graphic Calculator

2 Answers

### How to use the random number generator on the calculator.

Hello,
To access the Random number generator, press [MENU], Use arrows to select [RUN] and press [EXE].
In [RUN] press [OPTN][F6:->] to pan to the right then press [F3:PROB] then [F4:RAND#]. The command echoes on the screen.
1. Now if you press [EXE] a number between 0 and 1 is generated.
2. Each time you press [EXE] a new number is generated.
Although it is not documented, I found out that if you enter RAND#(n) where n is an integer, it generates a number between (0 and n)

Hope it helps.

Nov 07, 2009 | Casio FX-9750GPlus Calculator

1 Answer

### Ran#

A random number generator exists on this calculator. It is accessible in RUN or PGRM modes by pressing the OPTN key. If you don not see a tab PROB at the bottom of screen, press the rightmost key to move to next page.

Anyway, RAND# generates a real number between 0 and 1.

For other numbers read on.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

[OPTN].......(NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

Nov 07, 2009 | Casio FX-7400G Plus Calculator

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