Answer:
B. Data from the sample is used to estimate unknown population parameters.
Step-by-step explanation:
Estimation is a mathematical approach of ascertaining data which is almost equal or similar to the true data. To get a proper estimate, data is obtained from a sample, (that is a small collection of data), and is then used to obtain the projected population parameter.
Data is said to be overestimated when it surpasses the true value, and underestimated when it falls below the true value. Estimates simply provide an idea of what the exact or accurate value should be.
It has wide applications in mathematics when figures are approximated, as well as in business in making future predictions which inform present decisions.
It is 9 since I did it all in my head and I am Indian
Answer:
Option C
Step-by-step explanation:
This is easy!
Y=1/2x-2
To find the point where the two lines intersect they are set equal to each other so that x can be found:
2x-5=-x+1
2x+x=1+5
3x=6
x=2
If x is known, x can be plugged into one of the two equations to find y.
y=-x+1=-2+1=-1
This means the point where they intersect is (2,-1).
We also know that the slope has to be 1/2 because the slope has to match the slope of the line it is parallel to.
Putting this into point slope form, we get:
(y-(-1))=1/2(x-2)
Which can be simplified into slope intercept form:
y+1=1/2x-1
y=1/2x-1-1
y=1/2x-2
Answer:
y=1/2x+2
Step-by-step explanation:
The equations come in the form of y=mx+c, where m is the gradient and c is the y-intercept. Looking at the graph we know that the y-intercept is (0,2), so that rules out options B and C.
To find the gradient is a little more tricky, but we can follow the formula:
, where rise is the vertical value and run is the horizontal value
So we sub in our values:
And simplify:
So now we sub in our new found values into y=mx+c:
y=1/2x+2
