A school has a hurdle track that is 1/5 of a mile long. They are considering extending the track to be 1/4 of a mile long. The c
2 answers:
Answer: 4/5
Step-by-step explanation:
Here, The hurdle track that is 1/5 of a mile long.
And, After extending the track, the length of the hurdle track = 1/4 of a mile
Therefore, the unit rate of length in the longer track per mile of length in the shorter track = the initial length of the hurdle track / the final length of the hurdel track
=
=
You might be interested in
Answer:
1)
b)
And we want 2/3 of the margin of error so then would be:
The margin of error is given by this formula:
(1)
And on this case we have that ME =0.00001111016 and we are interested in order to find the value of n, if we solve n from equation (1) we got:
(2)
Replacing we got:
So the answer for this case would be n=12 rounded up to the nearest integer
Step-by-step explanation:
Information given
0.082601, 0.082621, 0.082589, 0.082617, 0.082598
We can calculate the sample mean and deviation with the following formulas:
represent the sample mean
population mean
s=0.000013424 represent the sample standard deviation
n=5 represent the sample size
Part 1
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom, given by:
The Confidence level is 0.95 or 95%, and the significance would be and
, the critical value would be using the t distribution with 4 degrees of freedom:
Now we have everything in order to replace into formula (1):
Part 2
The original margin of error is given by:
And we want 2/3 of the margin of error so then would be:
The margin of error is given by this formula:
(1)
And on this case we have that ME =0.00001111016 and we are interested in order to find the value of n, if we solve n from equation (1) we got:
(2)
Replacing we got:
So the answer for this case would be n=12 rounded up to the nearest integer