Answer:
B. (-1, 2) and (4,7)
Step-by-step explanation:
Solve for the first variable in one of the equations, then substitute the result into the other equation.
Answer:17
Step-by-step explanation:
Plug in 4 in the place of x and then add 1
Please change your name from confused student.
We are decreasing so, we first of find 68% of 225
= 68 / 100 * 225 = 17/ 25 * 225 That is using 4 into 68 and 100
17/5 * 45 Using 5 into 25 and 225.
17 * 9 = 153.
Since we are decreasing then we are going to subtract this result from 225.
If we were increasing we would have added.
= 225 - 153 = 72.
That's our answer. Cheeers.
Coincidentally i i hi hi oh
Answer:
Critical value:
The 90% confidence interval for the population mean bromide concentration is (0.376, 0.39).
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 .
So it is z with a pvalue of , so . This value of z is the critical value
Now, find M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the mean subtracted by M. So it is 0.383 - 0.0066 = 0.376 cc/cubic meter
The upper end of the interval is the mean added to M. So it is 0.383 + 0.0066 = 0.39 cc/cubic meter
The 90% confidence interval for the population mean bromide concentration is (0.376, 0.39).