Question 947467
The data for the curve fit should be 
(10,30)
(20,58)
(30,120)
(40,220)
(50,455)
*[illustration YL.JPG].
I agree with you. 
That looks like the best fit.
.
.
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How does that linear solution even work?
For {{{x=10}}}, {{{y=3.784}}}
For {{{x=50}}}, {{{y=4.016}}}