Answer:
The margin of error is of 0.01.
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 Z-table as such z has a p-value of
.
That is z with a pvalue of
, so Z = 1.037.
The margin of error is of:

In which
is the standard deviation of the population and n is the size of the sample.
Standard deviation was 0.21.
This means that 
Sample of 450:
This means that 
What is the margin of error, assuming a 70% confidence level, to the nearest hundredth?



The margin of error is of 0.01.
Your answer would have to be 69with the remainder of 1
(open the picture for the shown work :) )
I got the answer Antonio had a head start of 3 meters.
The answer is 67% because it rounds to 67%
5% of 1000 is 5 * 1000 / 100 = 5000 / 100 = 50.