# Surf for More Math

## Lesson 6 - Comparing Theoretical and Experimental Probability

To encourage your child to have fun on the Web while learning about
Comparing Theoretical and Experimental Probability , here are some games
and interactive activities they can do on their own or in pairs.

**Goal**

Compare the theoretical probability of an event with the results of
an experiment.

**Builds Upon**

Student Book pages 404-405

**Instructions for Use**

Probability
lets your child compare theoretical and experimental probabilities.

To Use Probability, select a red button to the left of the screen -
die, spin, suit, card, or coin. The green line shows the theoretical
probability for each event.

Click '?' several times to generate an experimental probability. Click
'Reset' to return to the theoretical probability.

Crazy
Choices Game lets your child play three different games of chance
at once, to compare experimental and theoretical probabilities.

To use Crazy Choices Game, choose the type of game: throwing a die,
picking cards from a deck, spinning a spinner, flipping a coin, or another
game. In the text boxes below the type of game, describe 'what wins'.
For example, if the game is flipping a coin, what wins could be "heads."

Enter the probability as a fraction of winning each game your child
has described in 'Theoretical Probabilities'. For example, if the game
were flipping a coin with heads winning, the player would expect to
win one time for every two tries. Enter "1" in the upper box
and "2" in the lower box. Click the 'Show Decimal' button
to see the value as a decimal.

Click the 'Run' button. Input the number of times to run the game (up
to 10,000). If the 'Add runs to total' box is checked, these runs are
added to the previous totals. If it is unchecked, previous runs will
be cleared. The results of playing the game are displayed in the 'Experimental
Probabilities' section.

To erase all data from the previous game, click the 'Clear Experimental
Probabilities' button.