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?
Answer:19.2
Step-by-step explanation:
Take some points
As here < sign present line will be dashed and shading should be done below the line
So
Graph attached
Answer:
you gotta find x first
true