Answer: 
Step-by-step explanation:
The confidence interval for population mean is given by :-

Given : Sample size :
, which is a large sample , so we apply z-test .
Sample mean : 
Standard deviation : 
Significance level : 
Critical value : 
Now, a confidence interval at the 95% level of confidence will be :-

Answer:
first one with -1...21
Step-by-step explanation:
only one that follows quadratic formula format
Answer:
2006 sorry if I’m wrong I divided it by 2
Step-by-step explanation:
Answer:
85 ° is the answer to the question