25
85
150
128
Question 4 (Multiple Choice Worth 5 points)
(08.01)Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. He then asks those families if they plan to attend the party. He finds that 20% of the families plan to attend the party. He claims that 20% of the neighborhood families would be expected to attend the party. Is this a valid inference?
No, this is not a valid inference because he asked only 20 families
No, this is not a valid inference because he did not take a random sample of the neighborhood
Yes, this is a valid inference because he took a random sample of the neighborhood
Yes, this is a valid inference because the 20 families speak for the whole neighborhood
A)The number of students in the seventh grade who would be expected to prefer math to science are: 128
B) The true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
A sample refers to a smaller, manageable version of a larger group. It is a subset containing the characteristics of a larger population.
A) Given that, the total number of students in seventh grade are: 150 students.
Now he took a sample of 25 students and find that the 85% of the sample prefers math to science.
This means that out of the sample the number of students who prefer math to science is:
= 85 / 100 x 25
= 21.25
Now, out of the total seventh graders the number of students who prefer math to science is:
21.25 x 150 / 25 = 127.5 ≈ 128
B) From the question, we understand that:
Mark draws a random sample of 20 addresses from all 80 of the neighborhood addresses.
The above selection is a random sampling technique
Therefore, the true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
Learn more about samples, click;
#SPJ3
The expression for the given phrase is 5x+11/3x+8.
The given phrase is five times the sum of a number eleven divided by three times the sum of the number eight.
An expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division.
Let the unknown number be x.
Five times the sum of a number eleven = 5x+11
Three times the sum of the number eight = 3x+8
So, the expression is 5x+11/3x+8
Therefore, the expression for the given phrase is 5x+11/3x+8.
To learn more about an expression visit;
brainly.com/question/28170201.
#SPJ2
2 hours on the lake. How much was his total bill for the kayak rental and hours kayaking on the lake?
Step-by-step explanation:
The total bill will be the sum of the rent and the cost for the total time spent.
$15 + $6 * 2.5
$15 + $15
$30
Answer:
B
Step-by-step explanation:
I did the test
Answer:
The sum of infinite geometric series is:
40
Step-by-step explanation:
We have to find the sum of the geometric series which is given as:
which could also be written as:
As we know that any infinite series of the form:
is convergent if |x|<1
Here we have:
x=5/6<1
Hence,the infinite series is convergent.
Also we know that for infinite geometric series the sum is given as:
Here we have:
a=5/6 and common ration r=5/6
Hence, the sum of series is:
Hence, the sum of series is:
40
Answer:
A
Step-by-step explanation: