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Name:
Probability of Rock Paper Scissors
Write the players’ names in the chart below. Record what each player “throws”
in each round and then write which player wins.
Example: Player 1 throws Rock, Player 2 throws Paper. You write down Rock,
Paper, and then Player 2 wins. You must write down all ties!
Player :______________ Player 2: _____________
Winner:
Round 1
Round 2
Round 3
Round 4
Round 5
Round 6
Round 7
Round 8
Round 9
Round 10
Round 11
Round 12
Round 13
Round 14
Round 15
Round 16
Round 17
Round 18
Copyright © MakeMathMore.com, 2009. Permission is granted to transmit and copy
this document for educational purposes so long as it is not altered and not sold.
page 1
Prob. of Rock Paper Scissors
(1) After you complete the above data table write the sample space AND tree
diagram of the possible outcomes below. Remember, the first event is what the
first player does and the second event is what the second player does. The first
of each is done for you:
Sample Space: (complete 2 more groupings)
Rock(P1), Rock(P2)
Rock(P1), Paper(P2)
Rock(P1), Scissors(P2)
Tree Diagram: (complete 2 more trees)
Rock(P1)
Rock(P2) Paper(P2) Scissors(P2)
[tie]
[P2 win]
[P1 win]
Label the outcomes on the tree diagrams above as a win for the first player,
second player, or a tie.
(2) How many outcomes does the game have?
(3) What is the theoretical probability that the first player should win?
(fraction, decimal, and percent)
(4) What is the theoretical probability that the second player should win?
(fraction, decimal, and percent)
(5) Is this game fair? Do both players have an equal opportunity to win the
game? EXPLAIN.
Copyright © MakeMathMore.com, 2009. Permission is granted to transmit and copy
this document for educational purposes so long as it is not altered and not sold.
page 2
Prob. of Rock Paper Scissors
(6) What is the experimental probability that the first player won? (fraction,
decimal, and percent)
(7) What is the experimental probability that the second player won? (fraction,
decimal, and percent)
(8) Compare the theoretical probability and experimental probability of one player
(you choose which player) throwing rock, paper, and scissors.
Rock: theoretical=
experimental=
Paper:
theoretical=
experimental=
Scissors:
theoretical=
experimental=
(9) Write a couple sentences comparing the experimental probability to the
theoretical probability. What did you find and why do you think it happened?
Copyright © MakeMathMore.com, 2009. Permission is granted to transmit and copy
this document for educational purposes so long as it is not altered and not sold.
page 3
Prob. of Rock Paper Scissors