When calculating the experimental probability that a spinner would land on an even number, we are comparing the number of times the event occurs to the number of times the experiment is done.
P=Times the Event Occurs/Times the Experiment Is Done
This is very similar to the Probability Formula. Let's first look at the spinner.
The spinner has 4 parts, numbered 1 to 4. Now, we can look at the frequency table and find the number of times the spinner will land on an even number.
Outcome
Tally
Frequency
1
|||
3
2
|||| ||
7
3
|||| |
6
4
||||
4
Now, we can sum the respective frequencies of
even-numbered outcomes and find the number of times the event occurs.
7+4= 11 ← Times the Event Occurs
We calculated that the number of times the event occurs is equal to 11. In order to find the number of times the experiment is done, we should calculate the sum of all frequencies.
3+7+6+4= 20 ← & Number of Times the & Experiment Is Done
The experiment is done 20 times. Now, we have enough information to calculate P(Even).
P=Times the Event Occurs/Times the Experiment Is Done
