The reason that when doing experiments scientists usually do more than one trial is because in just one trial, something might not be working correctly, and something could've gone wrong. Being able to do more tests means that they can average it together in the end, so that all of the data is able to be more accurate. Since nothing is perfect, something may have gone wrong in one trial, but not another. By looking at all of the trials after done, you can compare them all and be able to see how they varied, because they will never be the same, no matter how many times you try.
Hope this helped, can I get brainliest :)
