Answer:
Step-by-step explanation:
we know that
Let
x------> the number of nickel coins
y-----> the number of quarter coins
we know that
-----> equation A
----> multiply by 100 both sides
-----> equation B
Substitute equation A in equation B and solve for y
------>
To compute the mean, you simply have to sum all the elments in the data set and the divide the sum by the number of elements:
To compute the variance, we first need to compute the distance of each element from the mean. To do so, we build a "parallel" dataset, given by the difference of every value and the mean:
Now we need those difference squared:
The variance is the mean of this new vector, so
Finally, the standard deviation is simply the square root of the variance, so you have
let's recall the vertical line test, if a vertical line hits the graph or points twice, then is NOT a function. Check the picture below.
