Answer:
The 95% confidence interval for the true population mean of pollutant discharge is (26.7 tons, 33.7 tons).
Step-by-step explanation:
Let <em>X</em> represent the daily level of pollutant discharge in the manufacturing district in Pittsburgh.
The monitoring equipment reveals that for the 28 days of the February month
Mean daily discharge per factory, (
) = 30.2 tons
Standard deviation daily discharge per factory, (<em>s</em>) = 9.1 tons
Compute the critical value of <em>t</em> for 95% level of confidence and (n - 1 =) 27 degrees of freedom as follows:

*Use a t-table.
Compute the 95% confidence interval for the true population mean of pollutant discharge as follows:


Thus, the 95% confidence interval for the true population mean of pollutant discharge is (26.7 tons, 33.7 tons).
Answer:
k - 3
Step-by-step explanation:
In this expression, only 8k and 7k can be subtracted. This is because they have the same variable, meaning they are "like terms".
8k - 7k - 3 = 1k - 3
Answer:
(1 , 6)
Step-by-step explanation:
the center of the circle is the midpoint of the diameter
Which is the point of coordinates:

Then the center is the point :

Answer:
425733.32
Step-by-step explanation:
3%= 12772×100÷x
3x= 12772×100
x=425733.34
Answer:
The correct answer is = p = 15 and q = 6.
Step-by-step explanation:
Given:
Perimeter of rectangle = 42 cm
p - q = 9 cm
length = p
width = q
we know:
Perimeter of rectangle= 2(l+w)
solution:
42 = 2(P+q)
21= p+q
Difference of p and q = 9 cm.
Then, P+q=21 .... 1
P-q=9 ....2
Adding both 1 and 2
2P = 30
P= 15cm and
q = 15-9
= 6cm