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?
. 5
-9+6=-x+4
You need to change the sign
Answer:
yes
Step-by-step explanation:
Answer:
x = - 8, y = 2
Step-by-step explanation: