Answer:
The critical value for the 95% confidence interval is z = 1.96.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
So it is z with a pvalue of 
, so z = 1.96.
The critical value for the 95% confidence interval is z = 1.96.
Step-by-step explanation:
(500/8)15=937.5 meters in 15 minutes
62.5 m in one minute
If you multiply 230 by 0.2 you will get 46. Subtract 46 from the 230 and get 184, that's what 230 is when it's 20% off!
