Exercise 1 Page 787

When calculating the experimental probability, we are comparing the $\text{number}$ $\text{of}$ $\text{times}$ $\text{the}$ $\text{event}$ $\text{occurs}$ to the $\text{number}$ $\text{of}$ $\text{times}$ $\text{the}$ $\text{experiment}$ $\text{is}$ $\text{done}.$ This is very similar to the Probability Formula. Here, we roll a number cube and we gather the results in the table. Let's calculate the total number of times the number cube was rolled.

Number	Times Rolled
$1$	$7$
$2$	$9$
$3$	$10$
$4$	$12$
$5$	$6$
$6$	$6$
Sum	$50$

We can see that our experiment was done $50$ times and we rolled four $12$ times. Now we have enough information to calculate $P(\text{four}).$ The experimental probability that the next roll will be four is $\frac{6}{25}.$