Answer with Step-by-step explanation:
Since we have given that
Number of students = 100
Mean = 21.3 years
In what way are descriptive statistics involved in this example?
As we know that descriptive statistics gives information that explains the data is specific manner and while measuring the mean age of the 100 students she needs to collect data by asking their age from them.
In what way are inferential statistics involved?
As we know that inferential statistics form inferences about given populations using given data, so when she estimate the mean age of 100 students, she will use data of 100 students. So, she is using inferential statistics.
Answer: 25 hours
Step-by-step explanation:
Let r = rate, t = time
From 1st sentence,
5r x 12 = 3
60r = 3
r = 3/60 = 1/20
From the next,
4r x t = 5
4 x 1/20 x t = 5
4/20t = 5 = 25
Answer:
the graph of y=x^2-4x is parabola as shown in the image
Step-by-step explanation:
The graph of
by drawing the line y=x-4
so this gives us that the line y=x-4 satisfies the equation ![y = x^{2} -4x](https://tex.z-dn.net/?f=y%20%3D%20x%5E%7B2%7D%20-4x)
To get points put y = x - 4 in the equation ![y = x^{2} -4x](https://tex.z-dn.net/?f=y%20%3D%20x%5E%7B2%7D%20-4x)
so we get x -4 = x( x- 4)
x =1 and x - 4 = 0
from here we get x = 1,4
now put these values in y = x -4
From here we get y = -3,0
so the points are (1 , -3) and ( 4 , 0)
Plot these on graph and we get the straight line .
For equation ![y = x^{2} -4x](https://tex.z-dn.net/?f=y%20%3D%20x%5E%7B2%7D%20-4x)
As we know it is of type of parabola with shifted centre.
Learn more about parabola graph here -brainly.com/question/27086410
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Answer: r≈ 9.99ft
Using the formula
C=2 π r
Solving for r
r= C/2π = 62.8/2·π ≈9.99493ft