The confidence interval would be (0.122, 0.278).
We first find our z-score. We want a 95% confidence interval:
0.95/2 = 0.475
Looking this up in the z-table, (http://www.statisticshowto.com/tables/z-table/) we see the z-score is 1.96.
The formula we will use is:

In this problem, p = 20/100 = 0.2, and n=100:
Answer:
(1.35, 1.6)
Step-by-step explanation:
A screenshot of the graph is attached.
Once we graph the equations
and
, the solution to this system will be their intersection point.
Tracing the graph on the calculator, we see that the point of intersection is at about (1.35, 1.6).
Answer:
A is approximately 201 cm^2
Step-by-step explanation:
The diameter of the circle is 16 so the radius is 1/2 of the diameter
1/2 * 16 = 8
The area of the circle is
A = pi r^2
A = 3.14 * 8^2
A =200.96 cm^2
A is approximately 201 cm^2
Answer and Step-by-step explanation:
According to the situation, The probabilities for each one is given below:
As there are 20 families
So the probabilities for each one is
For four families have one child is

For eight families have two children is

For five families have three children is

For two families have four children is

For one family have five children is
