pls answer ASAP this is due in 10 min

Ineed with number 17 i don’t get it at alll

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.