Answer
QR=22.22%
PQ=44.44%
RS=33.33%
Not RS= 77.78%
Step-by-step explanation
Probability is about determining how much of a part takes up the whole. In this case, the whole is 18, because this is the total length.
For QR, the length of the segment is 4, so we can say 4/18 because the segment is 4 parts of the 18 total length.
To determine percent, we divide and multiply by 100%
4/18=0.2222*100%=22.22%
Similarly, PQ is 8 parts of the whole 18, so
8/18=0.4444*100%=44.44%
And RS is:
6/18=0.3333*100%= 33.33%
We can verify that we are correct by adding all these percentages together, knowing that they should equal 100%. Here, we add them and get 99.99%, which verifies we are correct. There is an error of .01% because we have been rounding.
Finally, the parts that are not RS are QR and PQ, so we must add QR and PQ to determine how many parts they are of the 18 whole.
QR+PQ= 14/18=0.7778*100%= 77.78%