Answer:
, option D
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
From a random sample of 50 students, she found that 32 students read at least 1 book last month.
This means that
90% confidence level
So , z is the value of Z that has a pvalue of , so .
Confidence interval:
So the correct answer is given by option D.
The numbers are "x" and "y",
we suggest this system of equations.
x+y=24
x-y=15
solve by reduction method.
x+y=24
x-y=15
-----------------
2x=39 ⇒x=39/2=19.5
x+y=24
-(x-y=15)
-------------------
2y=9 ⇒y=9/2=4.5
The numbers are 19.5 and 4.5
To check
19.5+4.5=24
19.5-4.5=15
Answer:
Undefined
Step-by-step explanation:
If a linear equation is organized in the form x=[a number], we know straight away that this line is a vertical line. This form is actually , where is the x-intercept of the line. Vertical lines do not have a y-intercept because they are parallel to the y-axis.
The slope of vertical lines is undefined.
I hope this helps!
Answer:
2200 cm
Step-by-step explanation:
5.5 cm multiply by 400 cm.
Vertices are formed when 2 sides come together on a polygon. So they are basically corners. The smallest amount of sides a polygon has is 3, which would be a triangle. And triangles have 3 corners, because with a triangle, each side touches the other two. So the minimum number of vertices needed to form a polygon would be 3.