I hope you're reading this because I didn't answer your question.
Y=x squared
Every x squared equals y
English translation:
If the quality control manager wants to estimate the average life of lamps with 20 hours, with a confidence level of 95% and an error of 10% is assumed. What is the sample size?
F(-4)= 9*3^(-4)=9/(3^4)=1/9
We can’t see the picture sorry