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Texas Instruments TI-84 Plus Silver Edition Manual

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Chapter 2: Math, Angle, and Test Operations 40
Chapter 2:
Math, Angle, and Test Operations
Getting Started: Coin Flip
Getting Started is a fast-paced introduction. Read the chapter for details.
Suppose you want to model flipping a fair coin 10 times. You want to track how many of those 10 coin
flips result in heads. You want to perform this simulation 40 times. With a fair coin, the probability of a
coin flip resulting in heads is 0.5 and the probability of a coin flip resulting in tails is 0.5.
Keyboard Math Operations
Using Lists with Math Operations
Math operations that are valid for lists return a list calculated element by element. If you use two lists in
the same expression, they must be the same length.
1. Begin on the home screen. Press || to display the
MATH PROB menu. Press 7 to select 7:randBin( (random
Binomial).
randBin( opens in a wizard. Press 10 to enter
the number of coin flips. Press †. Press Ë 5 to enter the
probability of heads. Press †. Press 40 to enter the
number of simulations. Press † and Í to paste the
expression on the home screen.
2. Press Í to evaluate. A list of 40 elements is
generated. The list contains the count of heads resulting
from each set of 10 coin flips. The list has 40 elements
because this simulation was performed 40 times. In this
example, the coin came up heads five times in the first set
of 10 coin flips, five times in the second set of 10 coin
flips, and so on.
3. Press ~ or | immediately to view the additional counts
in the list. An arrow (MathPrint™ mode) or an ellipses
(Classic mode) indicate that the list continues beyond the
screen.
Note: You cannot scroll a list if you enter a new line (the
scrolling key ~ is no longer active).
4. Press ¿ydÍ to store the data to the list name
L1. You then can use the data for another activity, such as
plotting a histogram (Chapter 12).
Note: Since randBin( generates random numbers, your
list elements may differ from those in the example.
Notice the busy indicator in the status bar when random
numbers are generated.
MathPrint™
Classic
… 47 …


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