Ok, so:
Morgan roll a number cube with the numers one through 12.
To find the probability, we have to identify the favorable cases and all the possible cases.
In this example, we want to find the probability to roll an even number.
So:
Numbers she rolled:
1 2 3 4 5 6 7 8 9 10 11 12.
Of these numbers, we notice that there's 6 even numbers:
1 2 3 4 5 6 7 8 9 10 11 12.
Now, the probability will be:
P = 6 even numbers (Favorable cases) / 12 numbers in total
P = 1/2.
Then, we express 1/2 in percent, multiplying by 100%:
1/2 * 100% is equal to 50%.