Can someone check this chemistry answer? Has to do with calculating ppm?

Good thing you found me. I am a Professor of Mathematics at the University of Gottingen. You can trust me. As the father of the formalist school, I find the following truth to be self-evident: All numbers are created equally significant. It is foolish and presumptuous to even consider some more significant than the others. Many of my colleagues consider e, pi and i more significant. This is absolutely insane! I have published multiple papers proving this self-evident fact! In the meeting of the World Mathematics Congress Olympics of 1896 in Vienna, Georgia SSR, we decided that I will live forever. I am still alive! Come dig me out of my grave! My laptop is running out of batteries. Back in my day, if you wanted significant figures of numbers, you had to walk them outside and shoot them. We have come a long way and the arch of justice is bending towards more justice. My grandfather would have been so proud that he would have said "Wir mussen wissen. Wir wissen missen." I have no idea what that means. I don't even speak Norwegian. I think we were drunk when he said it. He just ped away, too. I'm tearing up. Trust me, I'm a mathematician, the poet of numbers and graphs and categories. I'm sure your answer is in some statistics textbook. Let me look it up in my library of books. According to a history textbook, the most significant figure ever was George Washington. I don't buy it. Let me figure the answer out with my ginormous pulsating brain. Don't look behind the curtain!!! You stupid scarecrow! How do you even live without a heart? That's dumb. You need circulation in your body! Duh! 1.9 * 10^2 is the answer. WRITE IT DOWN IMMEDIATELY AND RUN AWAY! ESCAPE WHILE YOU... I'm a mathematician. Trust me!