Answer:
No, I don't believe that percent of girls born in china is 46.7.
Step-by-step explanation:
Given
Natural ratio of girls to boy =100:105
In China , the birth ratio = 100:114
Number of girls=46.7%
In our study
Number of girls=60
Number of boys= 90
Total number of birth =150
To find the percentage of girls in our study
Percentage of girls=40%
Therefore, the percentage of girls in our study is 40% not 46.7%
Hence, I don't believe that percentage of girls born in China is 46.7%.
Answer:
A
Step-by-step explanation:
Perpendicular bisector of a line divides the line into 2 equal parts and it is perpendicular to the line.
First let's find the midpoint of CD. The point is where the perpendicular bisector will cut through the line.
midpoint=
Thus, midpoint of CD
Gradient of line CD
The product of the gradients of perpendicular lines is -1.
gradient if perpendicular bisector(1)= -1
gradient of perpendicular bisector= -1
y=mx +c, where m is the gradient and c is the y-intercept.
y= -x +c
Subst a coordinate to find c.
<em>Since the perpendicular bisector passes through the point (8, -10):</em>
When x=8, y= -10,
-10= -8 +c
c= -10 +8
c= -2
Thus, the equation of the perpendicular bisector is y= -x -2.