Answer:
The length is
The width is
Step-by-step explanation:
we know that
The area of rectangle is equal to
we have
so
-----> equation A
------> equation B
substitute equation B in equation A and solve for L
using a graphing tool------> solve the quadratic equation
The solution is
see the attached figure
<em>Find the value of W</em>
Answer:
Step-by-step explanation:
We have the standard deviation for the sample, so we use the t-distribution to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 20 - 1 = 19
99% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.861.
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The format of the confidence interval is:
In which is the sample mean
So