I believe the answer is C also trying using the website desmos it helps a lot with graphing
If you are looking for the average speed, it is 2m/1 sec.
Ok...we got 250 people
30% are French, 35% are Americans, 20% are Germans....thats 85%.
This means 15% are from other countries
3 not from other countries...
0.85 * 0.85 * 0.85 = 0.6
0.6(250) = 150 students <===