Hi,
I post this here because my lecturer(DR.) thinks I'm wronge, but i'm convinced there's a problem here. so I tried to calculate the Q function(normalized) of the number 7, which is the integral of e^((-x^2)/2) from 7 to infinity. of course I can't put infinity on the calculator so therfore I put a very big number. that gave me 0. but when I integrate from 7 to lets say 8, I get 10^-12. firstly I thought it has to do with the limitation of 10^-99, but thats not the case. the thing is, that as I increase the area under the graph of the function, I get smaller numbers which is against logic. it can't be that from 7 to 8 I get 10^-12, and from 7 to 2000 I get 10^-51, and from 7 to 3000 I get 10^-84, and so on. it can't get smaller as I increase the upper limit of the integral, it doesnt make sense, the function is all positive. I decided to test this with integral solver online- guess what, the integral doesn't get smaller there, it just stays constant as I increase the upper value of the integral, which make sense because eventually the numbers get so small that it just adds 0+0+0+0.... and the integral solution number just stays the same. so what is happening with my fx-991? I failed a question on the exam because of false values which it gave me, and no one believes me, and no one can't understand my claim. what do you think? try to calculate for your self , and also try to calculate seperately in this site : https://www.integral-calculator.com/
and compare.. thank you, good day.
I post this here because my lecturer(DR.) thinks I'm wronge, but i'm convinced there's a problem here. so I tried to calculate the Q function(normalized) of the number 7, which is the integral of e^((-x^2)/2) from 7 to infinity. of course I can't put infinity on the calculator so therfore I put a very big number. that gave me 0. but when I integrate from 7 to lets say 8, I get 10^-12. firstly I thought it has to do with the limitation of 10^-99, but thats not the case. the thing is, that as I increase the area under the graph of the function, I get smaller numbers which is against logic. it can't be that from 7 to 8 I get 10^-12, and from 7 to 2000 I get 10^-51, and from 7 to 3000 I get 10^-84, and so on. it can't get smaller as I increase the upper limit of the integral, it doesnt make sense, the function is all positive. I decided to test this with integral solver online- guess what, the integral doesn't get smaller there, it just stays constant as I increase the upper value of the integral, which make sense because eventually the numbers get so small that it just adds 0+0+0+0.... and the integral solution number just stays the same. so what is happening with my fx-991? I failed a question on the exam because of false values which it gave me, and no one believes me, and no one can't understand my claim. what do you think? try to calculate for your self , and also try to calculate seperately in this site : https://www.integral-calculator.com/
and compare.. thank you, good day.