Texas Instruments TI-73VSC Teachers Guide - Page 60

Give Me 5

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Activity 10 Give Me 5! Probability ♦ order of operations ♦ mental math ♦ basic computation 55 Students investigate the results of tossing 5 coins. They compare what happens to what is expected to happen. Materials ♦ student activity sheets (provided) ♦ TI-73 ³ Setup ♦ If your TI-73s have not been used for any random numbers prior to this activity, you and your students need to store an integer "seed value" to rand in each TI-73. With each rand execution, the TI-73 generates the same random-number sequence for a given seed value. The TI-73 factory-set seed value for rand is 0. To generate a different random-number sequence, store any non-zero seed value to rand. 1. Enter the number you want for your seed value. Have students use different seed values. (In the example at the right, 1 is used.) 2. Now press X 1 " " 1 b 1 " " 1 b b. (For more information about seed values, refer to the "1 Probability Menu" section in the Math chapter of the TI-73 Guidebook .) ♦ Discuss with students events that are equally likely to occur, such as tossing a coin and getting a head or a tail. Á If you do not enter a seed value, rand uses whatever value happens to be the current seed. If there is no seed, it uses the factoryset value of 0. Á If you want to restore the factory-set seed value, store 0 to rand or reset the defaults. © 1998 TEXAS INSTRUMENTS INCORPORATED

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55
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Activity 10
Give Me 5!
Probability
♦
order of operations
♦
mental math
♦
basic computation
Students investigate the results of tossing 5 coins.
They compare what happens to what is expected to
happen.
Materials
♦
student activity sheets (provided)
♦
TI-73
³
Setup
♦
If your TI-73s have not been used for any random
numbers prior to this activity, you and your students
need to store an integer “seed value” to
rand
in each
TI-73.
With each
rand
execution, the TI-73 generates the
same random-number sequence for a given seed value.
The TI-73 factory-set seed value for
rand
is
0
. To
generate a different random-number sequence, store
any non-zero seed value to
rand
.
If you do not enter a seed
value,
rand
uses whatever
value happens to be the
current seed. If there is no
seed, it uses the factory-
set value of
0
.
1.
Enter the number you want for your seed value.
Have students use different seed values. (In the
example at the right,
1
is used.)
2.
Now press
X
1
"
"
1
b
1
"
"
1
b
b
.
(For more information about seed values, refer to the
“
1
Probability Menu” section in the Math chapter
of the
TI-73 Guidebook
±
.)
♦
Discuss with students events that are equally likely to
occur, such as tossing a coin and getting a head or a
tail.
If you want to restore the
factory-set seed value,
store
0
to
rand
or reset
the defaults.