Answer:
The 95% confidence interval for the true proportion of Gastown residents living below the poverty line is (0.133, 0.2766).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence interval , we have the following confidence interval of proportions.
In which
Z is the zscore that has a pvalue of .
For this problem, we have that:
He takes a simple random sample of 122 people living in Gastown and finds that 25 have an annual income that is below the poverty line. This means that and
We have , z is the value of Z that has a pvalue of = 0.975, so .
The lower limit of this interval is:
The upper limit of this interval is:
The 95% confidence interval for the true proportion of Gastown residents living below the poverty line is (0.133, 0.2766).
The total expression represents the total number of pants and shirts Chris bought.
25p = Total cost of pants
18(p+4) = Total cost of shirts
Answer:
240, 1800, 2040
Step-by-step explanation:
First find the surface area of the shape - base = 3 x 15 x 2 + 40 x 15 + 40 x 3 x 2 = 930 m ^2
Now find the area of base = 40 x 15 = 600
Now, the cost of painting = 10 pounds for 25 m^2. SO here cost = 600 / 25 x 10 = 24 x 10 = 240 pounds.
Now cost of tiles = 600 x 3 = 1800
Total cost = 1800 +240 = 2040
Plug in -2 for y then solve for x. The answer should be x= -2