Answer:
Margin of error of 0.0485 hours.
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 
.
That is z with a pvalue of 
, so Z = 1.96.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
In this question:
The margin of error is of:
Margin of error of 0.0485 hours.
Answer:
0.6561
Step-by-step explanation:
i think i could be wrong if am right brainliest
Answer:
a. Let x = hours surfing and let y = hours lifting weights
b. x + y = 6
c. 100x + 75y = 500
I think for the last one you have to multiply it by 5 to get the answer
